drm/xe/mmio_gem: reject VM_EXEC and drop VM_DONTCOPY

Hardware MMIO registers should never be executable; reject VM_EXEC
at mmap time and clear VM_MAYEXEC to prevent later mprotect attempts.

Also drop VM_DONTCOPY so that child processes across fork() can
inherit the mapping and lazily fault in the PFNs, matching standard
DRM GEM semantics and making the existing drm_gem_vm_open() callback
functional.

This aligns with existing PCI_BARRIER, which will use this in the next
patch. We don't want any noticeable behaviour change there, since this
will be user visible. This will also be the first user.

Assisted-by: LLM
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Tejas Upadhyay <tejas.upadhyay@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Ilia Levi <ilia.levi@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patch.msgid.link/20260908165046.1393557-17-matthew.auld@intel.com

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