drm/i915/chv: Combine GEN8_ROW_CHICKEN w/a

WaDisablePartialInstShootdown:chv and
WaDisableThreadStallDopClockGating:chv are related to the same
register so combine them.
Signed-off-by: NArun Siluvery <arun.siluvery@linux.intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -788,12 +788,10 @@ static int chv_init_workarounds(struct intel_engine_cs *ring)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	/* WaDisablePartialInstShootdown:chv */
-	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
-		  PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);
-
 	/* WaDisableThreadStallDopClockGating:chv */
 	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
-		  STALL_DOP_GATING_DISABLE);
+			  PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE |
+			  STALL_DOP_GATING_DISABLE);
 
 	return 0;
 }