codec2: Fix width and height when output is cropped

Return cropped width and height instead of block's width
and height

Test: cts-tradefed run cts -m CtsMediaBitstreamsTestCases \
 -t android.media.cts.bitstreams.H264Yuv420_8bitBpBitstreamsTest
Bug: 132042537

Change-Id: I72538248fff4aeb9f0ad51e6e0d8844f66f20f92
3 files changed