set software codec prioirty to match MediaCodec looper

MediaCodec looper's prioirty is set in android_media_MediaCodec.cpp
(MediaCodec jni) to ANDROID_PRIORITY_VIDEO, not AUDIO. Setting sw
codec looper priority to AUDIO could starve client side if the sw
decoder is running ASAP.

bug: 73898805
test: android.video.cts.VideoEncoderDecoderTest,
YouTube VP9 / VP9 HDR playback
Change-Id: I3efa975b843976d7c2886c5a802241a1dfe2fa0f