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The original V4L2VideoEncodeAccelerator execute IOCTLs to configure
framerate and bitrate every RequestEncodingParametersChange() even
though they are the same as the last configured values.

This CL have V4L2VEA reconfigure the framerate and bitrate only
if they vary. This also fixes the flood of the parameter change
logging in chrome log.

Bug: None
Test: run VEA test on scarlet
Test: appr.tc/?vsc=h264&debug=loopback
Change-Id: Ibe830797436a05d31f516af0845211f5da707fc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082739
Auto-Submit: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748523}