C2SoftAomEnc: Fix encoding issues with 10bit av1 clips

Address for V component was wrongly computed for P010 case and the
source strides weren't used correctly.

Bug: 267373580
Test: atest android.mediav2.cts.CodecEncoderSurfaceTest \
   android.videocodec.cts.VideoEncoderTest

Change-Id: Icce1090243e8c6c73b6c6dfe142c47e48b3e15d8