app: Reset offset when iterating over dma ranges

Fix bug in trusty_app_dma_is_allowed_locked where offset variable
is not getting properly reset for each dma range struct.

Bug: 244776134
Test: build.py --test com.android.trusty.smc.test
Change-Id: I657218561c3c059e0a84df51a07b30b54053577d
1 file changed