drm/xe: switch xe_pagefault_queue_init() to using bitmap_weighted_or()

drm/xe: switch xe_pagefault_queue_init() to using bitmap_weighted_or()

The function calls bitmap_or() immediately followed by bitmap_weight().
Switch to using the dedicated bitmap_weighted_or() and save one bitmap
traverse.

Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Yury Norov <ynorov@nvidia.com>