drm: mali-dp: Enable Mali-DP tiled buffer formats

Enable the following formats
- DRM_FORMAT_X0L0: DP650
- DRM_FORMAT_X0L2: DP550, DP650

Reviewed-by: Brian Starkey <brian.starkey@arm.com>
Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181101151051.1509-4-alexandru-cosmin.gheorghe@arm.com