drm-uapi/xe: Remove unused flags

This aligns with kernel commit ("drm/xe/uapi: Remove unused flags"). As
a consequence, some tests which dependend on the removed flags are also
removed. Also, ensure that the removed flag values are no longer
accepted to prevent mismatch.

v2:
- Rebase after removal of persistent exec_queues (Francois Dugast)
- Update xe-fast-feedback.testlist (Rodrigo Vivi)

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