mpeg2ts: Add support for parsing HEVC stream in MPEG2 TS container

- Add support for the HEVC codec in ATSParser via ExtendedUtils
- Extract width & height from the raw bitstream
- Add IDR detection support for seek
- Update the HLS stack to handle HEVC

CRs-Fixed: 797719
Change-Id: Iac32de93c7876ca69d47f5a24f01122560ac7be8