i965/bufmgr: Add a create_from_prime_tiled function

This new function is an import and a set tiling in one go.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit b9e7b297)
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

Conflicts:
	src/mesa/drivers/dri/i965/brw_bufmgr.c