[Mellanox] Add hw-mgmt patch for SimX platform adaptation (#6782)

- Why I did it
System is stuck on 'starting' state on SimX platform because of infinite loop on 'hw-management-ready.sh' script .
The loop is polling to check if the hw-mgmt sysfs created before proceeding with the flow, for SimX platform the sysfs will never create so the system is not starting properly.

- How I did it
Add a condition to poll on hw-mgmt sysfs only if the switch is real HW and not SimX platform.

- How to verify it
Check "systemctl status hw-management.service" output on a SimX switch with this patch, the state will be "active".

Signed-off-by: Shlomi Bitton <shlomibi@nvidia.com>

platform/mellanox/hw-management/0003-Make-hw-mgmt-SimX-compatiable.patch

@@ -0,0 +1,48 @@
+diff --git a/usr/usr/bin/hw-management-ready.sh b/usr/usr/bin/hw-management-ready.sh
+index 3c9f7b6..05d143f 100755
+--- a/usr/usr/bin/hw-management-ready.sh
++++ b/usr/usr/bin/hw-management-ready.sh
+@@ -49,9 +49,12 @@ if [ -d /var/run/hw-management ]; then
+ 	rm -fr /var/run/hw-management
+ fi
+ 
+-while [ ! -d /sys/devices/platform/mlxplat/mlxreg-hotplug/hwmon ]
+-do
+-	sleep 1
+-done
++if [ -z "$(lspci -vvv | grep SimX)" ]; then
++        while [ ! -d /sys/devices/platform/mlxplat/mlxreg-hotplug/hwmon ]
++        do
++                sleep 1
++        done
++fi
++
+ echo "Start Chassis HW management service."
+ logger -t hw-management -p daemon.notice "Start Chassis HW management service."
+diff --git a/usr/usr/bin/hw-management.sh b/usr/usr/bin/hw-management.sh
+index 70f1297..e427a3d 100755
+--- a/usr/usr/bin/hw-management.sh
++++ b/usr/usr/bin/hw-management.sh
+@@ -1110,6 +1110,13 @@ do_chip_down()
+ 	/usr/bin/hw-management-thermal-events.sh change hotplug_asic down %S %p
+ }
+ 
++check_simx()
++{
++        if [ -n "$(lspci -vvv | grep SimX)" ]; then
++                exit 0
++        fi
++}
++
+ __usage="
+ Usage: $(basename $0) [Options]
+ 
+@@ -1135,6 +1142,8 @@ Options:
+ 	force-reload	Performs hw-management 'stop' and the 'start.
+ "
+ 
++check_simx
++
+ case $ACTION in
+ 	start)
+ 		if [ -d /var/run/hw-management ]; then

platform/mellanox/mlnx-fw-upgrade.j2

@@ -251,7 +251,7 @@ function UpgradeFWFromImage() {
 }
 
 function ExitIfQEMU() {
-    if [[ $(cat /sys/devices/virtual/dmi/id/chassis_vendor) = "QEMU" ]]; then
+    if [ -n "$(lspci -vvv | grep SimX)" ]; then
         ExitSuccess "No FW upgrade for SimX platform"
     fi
 }