linuxkpi: Add `struct xa_limit` support to xarray

[dumbbell]

Summary

The xa_alloc*() functions family takes a struct xa_limit to describe the range of IDs the caller wants to allocate. We were using a single mask to qualify a maximum ID only.

This commit changes that to use the same struct xa_limit. The logic did not change, except it now supports a minimum ID as well. The definition of XA_LIMIT() macro is adapted, as well as the definitions of xa_limit_* (only xa_limit_32b existed, the other two are added with this commit).

The DRM generic code started to use this struct xa_limit in Linux 6.12.

This is part of the update of DRM drivers to Linux 6.12.

Sponsored by: The FreeBSD Foundation

[bz]

This will definitively need a recompile. I hope really all callers used the xa_limit_32b macro before and no hard coded numbers. Thankfully we don't support any pre-5.1 drm-kmod so should be fine. I wonder how hps ended up implementing the old KPI there...

I believe its fine but a 2nd pair of eyes wouldn't hurt, especially on __xa_alloc_cyclic.