enable GuC authentication of HuC

enable GuC authentication of HuC

The HEVC/H.265 micro Controller (HuC) requires authentication via
the Graphics micro Controller (GuC) on pre DG2/MTL hardware.

HuC is required for Low Power Encoding with the
Intel Media Driver for VAAPI.

Using GuC for command submission caused memory corruption on DG2
and inconsistent errors on boot with Alder Lake, so GuC was
previously disabled entirely in a local change.

initial diff from and tested by rsadowski@ (on Alder Lake)