Replace the remaining usage of IDREG() with a new helper for setting the
value of a feature ID register, with the benefit of cramming in some
extra sanity checks.
Reviewed-by: Sebastian Ott <sebott@redhat.com>
Link: https://lore.kernel.org/r/20240619174036.483943-5-oliver.upton@linux.devSigned-off-by: Oliver Upton <oliver.upton@linux.dev>