i915: Update MTL/ARL GSC to v102.1.15.1926

This version is required to support ARL-H.

Release: 102.1.15.1926
Compatibility (API) Version: 1.0
SVN: 1

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>

WHENCE

@@ -5112,7 +5112,7 @@ File: i915/mtl_huc_gsc.bin
 Version: HuC API/APB ver 8.5.4 for Meteorlake
 
 File: i915/mtl_gsc_1.bin
-Version: GSC API/APB v1.0, release 102.0.10.1878, SVN 1 for Meteorlake
+Version: GSC API/APB v1.0, release 102.1.15.1926, SVN 1 for Meteorlake
 
 File: i915/bmg_dmc.bin
 Version: DMC API/APB ver 2 release 6 for Battlemage