Only allow load frro drawables from frro directory

Fixes: 383080440
Test: Used test app to verify drawable frros still work
Flag: EXEMPT bugfix
Change-Id: I4247e54f3ea0d9e4bf0d9f404e0272751a258ba2
(cherry picked from commit 12e49e7a)
DISABLE_TOPIC_PROTECTOR
Merged-In: I4247e54f3ea0d9e4bf0d9f404e0272751a258ba2