[Juniper][QFX5210] Fixing a few platform issues (#4857)

This patch addresses the following issues:
 1) Platform drivers were not loading in the latest images. Fixed
    the intialization script to make sure that all the drivers are
    loaded.
 2) Getting rid of "pstore: crypto_comp_decompress failed, ret = -22!"
    messages during the kernel boot, after moving to 4.19 kernel. The
    solution is to remove the files under '/sys/fs/pstore' directory.

Signed-off-by: Ciju Rajan K <crajank@juniper.net>

platform/broadcom/sonic-platform-modules-juniper/debian/sonic-platform-juniper-qfx5210.postinst

@@ -28,4 +28,5 @@ if [ -f $FIRST_BOOT_FILE ]; then
         # Creating the UEFI entry for the first time.
         efibootmgr -c -L "SONiC" -l "\EFI\BOOT\BOOTX64.EFI" > /var/tmp/efi_log 2>&1
     fi
+    rm -rf /sys/fs/pstore/*
 fi

platform/broadcom/sonic-platform-modules-juniper/qfx5210/utils/juniper_qfx5210_util.py

@@ -338,22 +338,21 @@ def system_ready():
 
 def do_install():
     logging.info('Checking system....')
-    if driver_check() == False:
-        logging.info('No driver, installing....')
-        status = driver_install()
-        if status:
-            if FORCE == 0:        
-                return  status
-    else:
-        print PROJECT_NAME.upper()+" drivers detected...."                      
+
+    status = driver_install()
+    if status:
+        if FORCE == 0:        
+            return  status
+
     if not device_exist():
         logging.info('No device, installing....')     
         status = device_install() 
         if status:
             if FORCE == 0:        
                 return  status        
     else:
-        print PROJECT_NAME.upper()+" devices detected...."           
+        print PROJECT_NAME.upper()+" devices detected...."
+
     return
 
 def do_uninstall():