Fix CTS VP8 decoder test for HW decoder which support
yuv420 output.

Bug: 16353967

When video decoder outputs yuv420 data and output frame
stride and/or slice height are greater than frame width
and height it is necessary to pack the frame before writing
it to yuv file for future PSNR calculation.

Verified CTS tests passed on N4, N5, Volantis L builds and
Galaxy S5, Xperia Z1, HTC M8 KK builds.

Change-Id: I5853068de99e0351b4127f7cc38082dbe6941dcb
1 file changed