drm/radeon/kms: block depthxy offset from use from userspace.

This could be used to bypass CS checks.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/reg_srcs/r300 b/drivers/gpu/drm/radeon/reg_srcs/r300
index 16f8f38..d927005 100644
--- a/drivers/gpu/drm/radeon/reg_srcs/r300
+++ b/drivers/gpu/drm/radeon/reg_srcs/r300
@@ -725,4 +725,3 @@
 0x4F50 ZB_HIZ_RDINDEX
 0x4F54 ZB_HIZ_PITCH
 0x4F58 ZB_ZPASS_DATA
-0x4F60 ZB_DEPTHXY_OFFSET
diff --git a/drivers/gpu/drm/radeon/reg_srcs/rs600 b/drivers/gpu/drm/radeon/reg_srcs/rs600
index 498c581..344405a 100644
--- a/drivers/gpu/drm/radeon/reg_srcs/rs600
+++ b/drivers/gpu/drm/radeon/reg_srcs/rs600
@@ -725,4 +725,3 @@
 0x4F50 ZB_HIZ_RDINDEX
 0x4F54 ZB_HIZ_PITCH
 0x4F58 ZB_ZPASS_DATA
-0x4F60 ZB_DEPTHXY_OFFSET
diff --git a/drivers/gpu/drm/radeon/reg_srcs/rv515 b/drivers/gpu/drm/radeon/reg_srcs/rv515
index 7432df7..9602026 100644
--- a/drivers/gpu/drm/radeon/reg_srcs/rv515
+++ b/drivers/gpu/drm/radeon/reg_srcs/rv515
@@ -483,4 +483,3 @@
 0x4F50 ZB_HIZ_RDINDEX
 0x4F54 ZB_HIZ_PITCH
 0x4F58 ZB_ZPASS_DATA
-0x4F60 ZB_DEPTHXY_OFFSET