drm/i915/bw: Fix DEPROGBWPCLIMIT handling on BMG

drm/i915/bw: Fix DEPROGBWPCLIMIT handling on BMG

DEPROGBWPCLIMIT is specified in %, so divide by 100 instead of 10.

Fortunately the deprobbwlimit is much lower than the peak memory
bandwidth on BMG, so whether we take 60% or 600% of the peak
bandwidth doesn't matter as the min() will pick the lower
deprobbwlimit anyway.

Eg. on the BMG here I get (with or without the fix):
 QGV 0: deratedbw=33600 peakbw=48000
 QGV 1: deratedbw=53000 peakbw=456000

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260522200346.17377-7-ville.syrjala@linux.intel.com
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>