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This CL moves the IsCtrlExposed function to the V4L2 device, so it can be
reused at other places. Additionally this reduces the number of IOCTLS executed
directly inside the VEA, to provide a better abstraction of the V4L2 device.

TEST=./video_encode_accelerator_unittest on hana

BUG=None

Change-Id: I37981e0b75adcd386a6065f25560dd89dce41791
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1969083Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: David Staessens <dstaessens@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732674}