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The "PN" subscript in PIXEL_FORMAT_YUVxxxPN formats are not
indicating the bits per pixel, but indicating the
nubmer of bits per pixel component/channel.
For eg: PIXEL_FORMAT_YUV420P10 is mapped to the ffmpeg
format AV_PIX_FMT_YUV420P10LE and this is not a 10bits per pixel
format, it has 15 bits in each pixel.

R=dalecurtis@chromium.org

Change-Id: Idafc9a3b8d1188154610638ce4db02964586aeb8
Reviewed-on: https://chromium-review.googlesource.com/c/1292819
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607146}