drm/i915: Make wm latencies monotonic

drm/i915: Make wm latencies monotonic

Some systems (eg. LNL Lenovo Thinkapd X1 Carbon) declare
semi-bogus non-monotonic WM latency values:
 WM0 latency not provided
 WM1 latency 100 usec
 WM2 latency 100 usec
 WM3 latency 100 usec
 WM4 latency 93 usec
 WM5 latency 100 usec

Apparently Windows just papers over the issue by bumping the
latencies for the higher watermark levels to make them monotonic
again. Do the same.

Cc: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250919193000.17665-12-ville.syrjala@linux.intel.com
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>