Initialize AppCompatCallbacks in system server

This ensures that any calls made (intentionally or not) in the system
server using the Compatibility (in-app process) gating APIs will always
return true, and log the gated feature.

Bug: 143591326
Test: m
Change-Id: I96792cf852f4167fc39d5055704f8617efaae25e
(cherry picked from commit f965d151cc4ddcc7c343b048e4493d011d379644)
1 file changed