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V4L2IP sets plane length to the area of coded size and offset.
This is wrong if the width of coded_size is different from the
stride of the underlying buffer. This CL corrects it by setting
to the size of GpuMemoryBufferPlane.

Bug: None
Test: ip_test --gtest_filter=NV12* on kukui
Change-Id: I3e49e6ecd2442e00b8d6705cfb3e333efad0a9f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096427Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749539}