Disable privapp_permissions checking in GSI temporarily

Some vendor apps are using shared UID without white-listing the apps.
A runtime checking with these apps causes some devcies cannot boot
with GSI. We disable the checking before bug b/78105955 solved.

Bug: 79174430
Bug: 78105955
Test: Boot pixel devices with GSI applied the patch.
Change-Id: Ic25f5e2c4506b79564959adf57839a7ddc4330c2
diff --git a/target/board/gsi_system.prop b/target/board/gsi_system.prop
index 4b54aaf..0c04a95 100644
--- a/target/board/gsi_system.prop
+++ b/target/board/gsi_system.prop
@@ -3,3 +3,6 @@
 
 # GSI always disables adb authentication
 ro.adb.secure=0
+
+# TODO(b/78105955): disable privapp_permissions checking before the bug solved
+ro.control_privapp_permissions=disable