anv: Meet CCS alignment reqs with dedicated allocs

anv: Meet CCS alignment reqs with dedicated allocs

At image bind time, we require BOs to meet aux-map alignment
requirements in order to enable CCS on images. This is a heuristic
controlled by anv_bo_allows_aux_map().

To improve the chances of getting a properly aligned BO, we make use of
the dedicated allocation extension. Firstly, we report to applications a
preference for dedicated memory if an image would like to use the aux
map. Secondly, we align the VMA for dedicated allocations to meet
aux-map requirements.

To make enabling modifiers much easier on integrated gfx12, report
dedicated allocations as a requirement for modifiers which specify CCS.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> (v1)
Reviewed-by: Jianxun Zhang <jianxun.zhang@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25003>