drm/xe: Pass flags directly to emit_flush_imm_ggtt

drm/xe: Pass flags directly to emit_flush_imm_ggtt

This is more readable than the nameless booleans and will also come handy
later.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250307111402.26577-4-tvrtko.ursulin@igalia.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 52a237e8d6c4abcda40c71268ee6cec75aa62799)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>