drm/vmwgfx: Turn off support for multisample count != 0 v2

Do this until we know how much MOB memory to allocate for these surfaces.
v2: Mask also non-DX multisample.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_surface.c

@@ -1290,6 +1290,8 @@ int vmw_gb_surface_define_ioctl(struct drm_device *dev, void *data,
 	uint32_t size;
 	uint32_t backup_handle;
 
+	if (req->multisample_count != 0)
+		return -EINVAL;
 
 	if (unlikely(vmw_user_surface_size == 0))
 		vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +