Perf limit reasons bit positions were off by one.

Fixes: fa68bff7 ("drm/i915/gt: Add sysfs throttle frequency interfaces")
Cc: stable@vger.kernel.org # v5.18+
Signed-off-by: NAshutosh Dixit <ashutosh.dixit@intel.com>
Acked-by: NAndi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: NSujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Signed-off-by: NMatt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220908155821.1662110-1-ashutosh.dixit@intel.comSigned-off-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com>