Add HomeKit RPi transcoding

[shmuelzon]

Proposed change

Added support for the h264_v4l2m2m codec to utilize, among others, the Raspberry Pi's hardware h.264 encoder. Unfortunately, the implementation of the Pi's encoder doesn't use the standard h.264 profile names but expects a numerical value:

$ v4l2-ctl --list-ctrls-menu -d 11
h264_profile 0x00990a6b (menu)   : min=0 max=4 default=4 value=4
             0: Baseline
             1: Constrained Baseline
             2: Main
             4: High

To support that, this commit also adds the option to override the
default profile names used when passed to the FFmpeg encoding process.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logo's and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add h264_v4l2m2m codec and profiles to HomeKit cameras core#91246
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[bdraco]

Good to merge when parent PR merges