For some reason HDMI audio won't work unless you cast a magic IEEE Registration
Identifier alongside with its appropriate Components of Source Physical
Address. The easiest way to do this is to capture a wild HDMI EDID, study it,
and blindly copy bytes because you don't understand anything about their
possible meaning (if any).

This commit also changes the SAD API exposed by igt_edid, to allow for both a
SAD block and a VSD block to be included in the same CEA block.

Signed-off-by: Simon Ser <simon.ser@intel.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>