[DellEMC] S6100 Platform Service optimization (#10989)

Why I did it
- To reduce rc.local script execution time.
- Time consumption of rc.local script is around 22 seconds in S6100.
How I did it
- Moving platform-modules-s6100.service and s6100-lpc-monitor.service asynchronous to rc.local script.
How to verify it
- Load the image with the changes and the time consumption of rc.local script reduced from 22 seconds(approx.) to 14 seconds(approx.) during warm-/fast-reboot upgrades.
- sonic-mgmt test results.

platform/broadcom/sonic-platform-modules-dell/debian/platform-modules-s6100.init

@@ -1,40 +0,0 @@
-#!/bin/bash
-
-### BEGIN INIT INFO
-# Provides:          setup-board
-# Required-Start:
-# Required-Stop:
-# Should-Start:
-# Should-Stop:
-# Default-Start:     S
-# Default-Stop:      0 6
-# Short-Description: Setup S6100 board.
-### END INIT INFO
-
-case "$1" in
-start)
-    echo -n "Setting up board... "
-
-    /usr/local/bin/iom_power_on.sh
-    /usr/local/bin/s6100_platform.sh init
-
-    echo "done."
-    ;;
-
-stop)
-    /usr/local/bin/s6100_platform.sh deinit
-    echo "done."
-
-    ;;
-
-force-reload|restart)
-    echo "Not supported"
-    ;;
-
-*)
-    echo "Usage: /etc/init.d/platform-modules-s6100.init {start|stop}"
-    exit 1
-    ;;
-esac
-
-exit 0

platform/broadcom/sonic-platform-modules-dell/debian/platform-modules-s6100.postinst

@@ -1,11 +1,7 @@
 # postinst script for S6100
 
 # Enable Dell-S6100-platform-service
-depmod -a 
 systemctl enable platform-modules-s6100.service
-systemctl start platform-modules-s6100.service
-
-systemctl enable s6100-lpc-monitor.service
-systemctl start s6100-lpc-monitor.service
+systemctl start --no-block platform-modules-s6100.service
 
 #DEBHELPER#

platform/broadcom/sonic-platform-modules-dell/debian/rules

@@ -78,6 +78,9 @@ override_dh_auto_install:
 
 override_dh_usrlocal:
 
+override_dh_installmodules:
+	dh_installmodules --no-scripts;
+
 override_dh_clean:
 	dh_clean
 	set -e; \

platform/broadcom/sonic-platform-modules-dell/s6100/scripts/s6100_platform.sh

@@ -3,6 +3,30 @@
 #platform init script for Dell S6100
 
 if [[ "$1" == "init" ]]; then
+    depmod -a
+    case "$(cat /proc/cmdline)" in
+        *SONIC_BOOT_TYPE=warm*)
+            TYPE='warm'
+            ;;
+        *SONIC_BOOT_TYPE=fastfast*)
+            TYPE='fastfast'
+            ;;
+        *SONIC_BOOT_TYPE=fast*|*fast-reboot*)
+            TYPE='fast'
+            ;;
+        *SONIC_BOOT_TYPE=soft*)
+            TYPE='soft'
+            ;;
+        *)
+            TYPE='cold'
+    esac
+
+    if [[ "$TYPE" == "cold" ]]; then
+        /usr/local/bin/iom_power_on.sh
+    fi
+
+    systemctl enable s6100-lpc-monitor.service
+    systemctl start --no-block s6100-lpc-monitor.service
 
     pericom="/sys/bus/pci/devices/0000:08:00.0"
     modprobe i2c-dev
@@ -24,23 +48,6 @@ if [[ "$1" == "init" ]]; then
 
     systemctl start --no-block s6100-ssd-upgrade-status.service
 
-    case "$(cat /proc/cmdline)" in
-        *SONIC_BOOT_TYPE=warm*)
-            TYPE='warm'
-            ;;
-        *SONIC_BOOT_TYPE=fastfast*)
-            TYPE='fastfast'
-            ;;
-        *SONIC_BOOT_TYPE=fast*|*fast-reboot*)
-            TYPE='fast'
-            ;;
-        *SONIC_BOOT_TYPE=soft*)
-            TYPE='soft'
-            ;;
-        *)
-            TYPE='cold'
-    esac
-
     if [[ "$TYPE" == "cold" ]]; then
         systemctl start s6100-platform-startup.service
     else

platform/broadcom/sonic-platform-modules-dell/s6100/systemd/platform-modules-s6100.service

@@ -1,6 +1,6 @@
 [Unit]
 Description=Dell S6100 Platform modules
-Before=pmon.service determine-reboot-cause.service
+Before=pmon.service determine-reboot-cause.service pcie-check.service system-health.service watchdog-control.service
 DefaultDependencies=no
 
 [Service]

platform/broadcom/sonic-platform-modules-dell/s6100/systemd/s6100-platform-startup.service

@@ -1,6 +1,6 @@
 [Unit]
 Description=Dell S6100 Platform Startup Service
-Before=pmon.service determine-reboot-cause.service
+Before=pmon.service determine-reboot-cause.service pcie-check.service system-health.service watchdog-control.service
 DefaultDependencies=no
 
 [Service]