etnaviv: implement resource creation with modifier

etnaviv: implement resource creation with modifier

This allows to create buffers with a specific tiling layout, which is primarily
used by GBM to allocate the EGL back buffers with the correct tiling/modifier
for use with the scanout engines.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>