onclite: Init: Add system group for init.class_main.sh

/vendor/firmware_mnt/verinfo/ver_info.txt ownership
is now system,system. Hence need to add system group
for init.class_main.sh

Change-Id: I9c759c22aca7a8c5bc04908748f26916025c7b07
CRs-Fixed: 2534121
Signed-off-by: Dhina17 <dhinalogu@gmail.com>

rootdir/init.qcom.rc

@@ -439,6 +439,7 @@ on property:vendor.media.target.version=*
 service qcom-c_main-sh /vendor/bin/init.class_main.sh
     class main
     user root
+    group root system
     oneshot
 
 on property:vold.decrypt=trigger_restart_framework