[broadcom]: fix delay to load led proc init (#1940)

led start bcm cmd triggers link state notifications.
This is quick fix to avoid such fake link state notifications.

Signed-off-by: Guohan Lu <gulv@microsoft.com>

platform/broadcom/docker-syncd-brcm/start.sh

@@ -29,11 +29,13 @@ wait_syncd() {
         fi
         sleep 1
     done
+
+    # wait until bcm sdk is ready to get a request
+    sleep 3
 }
 
 # If this platform has an initialization file for the Broadcom LED microprocessor, load it
 if [ -r ${PLATFORM_DIR}/led_proc_init.soc ]; then
     wait_syncd
-    sleep 60 # wait until bcm sdk is ready to get a request
     supervisorctl start ledinit
 fi