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This is a workaround to match with iHD media driver that
shifts the quantization values by 50 while encoding.
https://github.com/intel/media-driver/blob/master/media_driver/linux/common/codec/ddi/media_ddi_encode_jpeg.cpp#L694

The patch ensures the shifted value in the
middleware generated packed header.
Linux media stack test cases claiming to have a significant
psnr improvement in Y plane (41.27 to 48.31) with this quirk.

BUG=None
TEST=./jpeg_encode_accelerator_unittest

Change-Id: Ie2316cce2b5c86fefeb3879872c881868687011b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2446208
Commit-Queue: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814326}