drm/i915/huc: update TGL HuC to v7.0.12

Update to the latest available TGL HuC, which includes changes required
by the media team.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tony Ye <tony.ye@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Acked-by: Tony Ye <tony.ye@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200229012042.27487-1-daniele.ceraolospurio@intel.com