drm/i915/dg2: Add support for new DG2-G12 revid 0x1

The bspec has been updated with a new revision 0x1 that
translates to A1 GT stepping and C0 display stepping.

Bspec: 44477
Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230829135945.1201574-1-swati2.sharma@intel.com

drivers/gpu/drm/i915/intel_step.c

@@ -124,6 +124,7 @@ static const struct intel_step_info dg2_g11_revid_step_tbl[] = {
 
 static const struct intel_step_info dg2_g12_revid_step_tbl[] = {
 	[0x0] = { COMMON_GT_MEDIA_STEP(A0), .display_step = STEP_C0 },
+	[0x1] = { COMMON_GT_MEDIA_STEP(A1), .display_step = STEP_C0 },
 };
 
 static const struct intel_step_info adls_rpls_revids[] = {