drm-uapi/xe: Remove PMU from Xe till uapi is finalized

Align with commit ("drm/xe/pmu: Remove PMU from Xe till uapi is finalized")

Signed-off-by: Francois Dugast <francois.dugast@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>