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The V4L2 workaround interface was taking the end position of the encoded
stream as a writable argument - this is dangerous and it doesn't even
need it, so remove it.

BUG=b:149663704
TEST=vdatest passes on Hana.

Change-Id: I6ec9b137e6e762fd999e6ae2462db4564b0e7134
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130452
Auto-Submit: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755246}