anv: allow offset > 2Gb from BO start with softpin
Ran into this with a really large perf query pool > 2Gb. This isn't strictly a fix because the behavior before ac6d7a17 was probably that we would wrap around offsets on 32bit which is broken.
Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Fixes: ac6d7a17 ("anv: Make anv_address::offset 64-bit")