drm/xe: Add vm_bind_ioctl_ops_fini helper

Simplify VM bind code by signaling out-fences / destroying VMAs in a
single location. Will help with transition single job for many bind ops.

v2:
 - s/vm_bind_ioctl_ops_install_fences/vm_bind_ioctl_ops_fini (Oak)
 - Set last fence in vm_bind_ioctl_ops_fini (Oak)

Cc: Oak Zeng <oak.zeng@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Oak Zeng <oak.zeng@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240425045513.1913039-10-matthew.brost@intel.com