drm/i915/uc: move GuC and HuC files under gt/uc/

drm/i915/uc: move GuC and HuC files under gt/uc/

Both microcontrollers are part of the GT HW and are closely related to
GT operations. To keep all the files cleanly together, they've been
placed in their own subdir inside the gt/ folder

Signed-off-by: Daniele Ceraolo Spurio <[email protected]>
Cc: Michal Wajdeczko <[email protected]>
Cc: Chris Wilson <[email protected]>
Acked-by: Michal Wajdeczko <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Chris Wilson <[email protected]>