i915: Update ADLP DMC to v2.20

Release notes:

  1. Pipe scanline counter hang issue fix.
  2. Fix for DC6v aggresive re-entry.

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

WHENCE

@@ -4682,7 +4682,7 @@ File: i915/adlp_dmc_ver2_16.bin
 Version: DMC API/APB ver 2 release 16 for Alderlake P
 
 File: i915/adlp_dmc.bin
-Version: DMC API/APB ver 2 release 19 for Alderlake P
+Version: DMC API/APB ver 2 release 20 for Alderlake P
 
 File: i915/adlp_guc_62.0.3.bin
 Version: GuC API/APB ver 62.0.3 for Alderlake P