Add check_feature helper

Test: VtsAidlKeyMintTargetTest
(cherry picked from commit 3d2ba0a137debcbf48a4efdd2016fe132293b6bc)
(cherry picked from commit b7d44a2eefc18bdb3fab322813613b564240eff5)
(cherry picked from https://android-review.googlesource.com/q/commit:352c383e0d9b6bbf98fd54afc63821e08cf6f9ee)
Merged-In: I4a5b2a41172c15ae29efb5b177eb86cea5527b4e
Change-Id: I4a5b2a41172c15ae29efb5b177eb86cea5527b4e
3 files changed