gallium: Create a new PIPE_CAP_TILE_RASTER_ORDER for vc4.

Because vc4 can control the order that tiles are rasterized in, we can use
it to implement overlapping blits using normal drawing and
GL_ARB_texture_barrier, as long as we can tell the kernel what order to
render the tiles in.

This commit introduces the core gallium support, vc4 changes will follow.

v2: Fix on the simulator.
v3: Add the cap (disabled) to other drivers, add rst docs for the cap.
v4: Rebase on PIPE_CAP_TGSI_ANY_REG_AS_ADDRESS
v5: Drop vc4 changes from this commit, for clarity.

Reviewed-by: Nicolai Hähnle <[email protected]> (v3)

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