The driver should now rely on cmask_offset because CMASK can be
disabled by the driver for some reasons (eg. mipmaps). Apply the
same change for FMASK, although it should be useless.
Fixes: ad1bc8621d ("radv: remove radv_get_image_fmask_info()")
Fixes: 10d08da52c ("radv/gfx10: add missing dcc_tile_swizzle tweak")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>