drm/i915: add clock gating regs to VLV offset check function

So we can write them properly.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: NAntti Koskipää <antti.koskipaa@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.c

@@ -1133,8 +1133,17 @@ static bool IS_DISPLAYREG(u32 reg)
 		return false;
 
 	switch (reg) {
+	case _3D_CHICKEN3:
+	case IVB_CHICKEN3:
+	case GEN7_COMMON_SLICE_CHICKEN1:
+	case GEN7_L3CNTLREG1:
+	case GEN7_L3_CHICKEN_MODE_REGISTER:
 	case GEN7_ROW_CHICKEN2:
+	case GEN7_L3SQCREG4:
+	case GEN7_SQ_CHICKEN_MBCUNIT_CONFIG:
 	case GEN7_HALF_SLICE_CHICKEN1:
+	case GEN6_MBCTL:
+	case GEN6_UCGCTL2:
 		return false;
 	default:
 		break;