MediaCodecListOverrides_test: Remove compile_multilib

MediaCodecListOverrides_test can be built for both 64 and 32 bit
configurations.

Also remove libstagefright_omx and omx includes that aren't needed.

Bug: 178228919
Test: atest MediaCodecListOverrides_test
Change-Id: I895537457adfa0db62bf42a65ec70598ce4dd61e
1 file changed