Draft: Support H264/H265 encoding on ANV

Still needs to fix some issues but welcome comments in general.

• H264

  • Support CQP mode only.
  • VDENC(Low power encoding) only.
  • Tested on gen9(CometLake) and gen12(AlderLake-P)
  • Issues
    • Cr channel not encoded.

• H265

  • Support CQP mode only.
  • VDENC(Low power encoding) only.
  • Tested on gen12(AlderLake-P),
  • Issues
    • The output of P frame encoding has small artifacts sometimes.
    • Need to test on gen11.