Add check_feature helper

Test: VtsAidlKeyMintTargetTest
Change-Id: I4a5b2a41172c15ae29efb5b177eb86cea5527b4e
Merged-In: I4a5b2a41172c15ae29efb5b177eb86cea5527b4e
(cherry picked from commit 3d2ba0a137debcbf48a4efdd2016fe132293b6bc)
3 files changed