drm/i915/adlp: Add ADL-P GuC/HuC firmware files

Add ADL-P to the list of supported GuC and HuC firmware versions. For
HuC, it reuses the existing TGL firmware file. For GuC, there is a
dedicated firmware release.

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210626004522.1699509-3-John.C.Harrison@Intel.com