hevc_enc: create misc parameter object for media studio va
hevc_enc: create misc parameter object for media studio va

For media studio va driver, HEVC encoding in CQP mode, it's needed to create
misc parameter, even though don't fill any value, or else the picture's quality
 will be low.

Signed-off-by: dongping wu <eada3ae4a96a673269eca90300aaefadacf3db15@intel.com>

YuJiankang/libyami,YuJiankang/libyami,01org/libyami,YuJiankang/libyami,01org/libyami,01org/libyami