i915: Update MTL DMC to v2.12

Release notes:

  1. Fix for DC5 with CMTG enabled.
  2. Register sequence change for underrun recovery.
  3. WA for DPST save/restore.
  4. WA for 3Dlut restore issue.
  5. WA for Audio issue.
  6. Interrupt fix for flip queue.
  7. Fix for DC6v aggresive re-entry

Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>

WHENCE

@@ -4689,7 +4689,7 @@ File: i915/mtl_dmc_ver2_10.bin
 Version: DMC API/APB ver 2 release 10 for Meteorlake
 
 File: i915/mtl_dmc.bin
-Version: DMC API/APB ver 2 release 11 for Meteorlake
+Version: DMC API/APB ver 2 release 12 for Meteorlake
 
 License: Redistributable. See LICENSE.i915 for details
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