etnaviv: drm-shim: add GC400
These are the ETNAVIV_PARAM's returned from a GC400 found on a STM32MP157C-DK2 Discovery Board running mainline kernel. Signed-off-by:Christian Gmeiner <christian.gmeiner@gmail.com> Tested-by: Marge Bot <mesa/mesa!3195> Part-of: <mesa/mesa!3195>