vaapijpegenc: Add a quantization quirk for iHD driver
iHD driver shifts the value by 50 when caculating quantization for JPEG encoding, so we should add 50 in this plugin for iHD driver too.
Edited by Haihao Xiang
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iHD driver shifts the value by 50 when caculating quantization for JPEG encoding, so we should add 50 in this plugin for iHD driver too.