drm/i915/gt: Whitelist COMMON_SLICE_CHICKEN1 for UMD access.

As part of the recommended tuning setting, whitelist COMMON_SLICE_CHICKEN1
for MTL/ARL and DG2.

The UMD will selectively enable or disable specific bits of the
register based on the type of workload and its requirements.

v2: Remove the KMD par of enabling specific bits(Matt R)

Bspec: 68331
Signed-off-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240825121156.2498810-1-dnyaneshwar.bhadane@intel.com

drivers/gpu/drm/i915/gt/intel_workarounds.c

@@ -2071,7 +2071,7 @@ static void dg2_whitelist_build(struct intel_engine_cs *engine)
 	case RENDER_CLASS:
 		/* Required by recommended tuning setting (not a workaround) */
 		whitelist_mcr_reg(w, XEHP_COMMON_SLICE_CHICKEN3);
-
+		whitelist_reg(w, GEN7_COMMON_SLICE_CHICKEN1);
 		break;
 	default:
 		break;
@@ -2086,7 +2086,7 @@ static void xelpg_whitelist_build(struct intel_engine_cs *engine)
 	case RENDER_CLASS:
 		/* Required by recommended tuning setting (not a workaround) */
 		whitelist_mcr_reg(w, XEHP_COMMON_SLICE_CHICKEN3);
-
+		whitelist_reg(w, GEN7_COMMON_SLICE_CHICKEN1);
 		break;
 	default:
 		break;