etnaviv: prep for UBOs

etnaviv: prep for UBOs

Allow UBO relocs and only emitting uniforms that are actually used.

GC7000Lite has no address register, so upload uniforms to a UBO object to
LOAD from.

I removed the code to check for changes to individual uniforms and just
reupload to entire uniform state when the state is dirty. I think there
was very limited benefit to it and it isn't compatible with relocs.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>