h264enc: fix h264 HDR comformance issues
h264enc: fix h264 HDR comformance issues

1. Let h264 level equal to max level, in order to support high level
bitrate, 4K encoding for example
2. As spec, only when bitstream contains 0x000000/0x000001/0x000002/0x000003
need to insert emulation byte 0x03

Signed-off-by: Zhong Li <ad6bffae321e88d39f25028f12e29bb1c91acd98@intel.com>

wlin70/libyami,wlin70/libyami,wlin70/libyami,wlin70/libyami