drm/xe: Replace dma_buf mem_access per direct xe_pm_runtime calls

Continue on the path to entirely remove mem_access helpers in
favour of the direct xe_pm_runtime calls. This item is one of
the direct outer bounds of the protection.

Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240222163937.138342-8-rodrigo.vivi@intel.com