drm/radeon: fix UPLL_REF_DIV_MASK definition

Stupid copy & paste error over all generations.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index d9a0054..75c0563 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -59,7 +59,7 @@
 #	define UPLL_SLEEP_MASK				0x00000002
 #	define UPLL_BYPASS_EN_MASK			0x00000004
 #	define UPLL_CTLREQ_MASK				0x00000008
-#	define UPLL_REF_DIV_MASK			0x001F0000
+#	define UPLL_REF_DIV_MASK			0x003F0000
 #	define UPLL_VCO_MODE_MASK			0x00000200
 #	define UPLL_CTLACK_MASK				0x40000000
 #	define UPLL_CTLACK2_MASK			0x80000000