manifest-test: Call finish_dma after prepare_dma

Make sure that each call to prepare_dma is matched with a call to
finish_dma. This is necessary to land a kernel change which can
detect incorrect pairings of these two calls.

Bug: 244776134
Test: build.py --test boot-test:com.android.manifesttest
Change-Id: I9cb3125f426114c0d57ea994b34a12630584320b
1 file changed