drm/xe/pf: Clamp maximum execution quantum to 100s

GuC is silently clamping values of the execution quantum and
preemption timeout KLVs to 100s. Perform explicit clamping on the
driver side as later there is no way to read back values used by
the firmware and we shouldn't mislead the user about actual values
being used when we print them in dmesg or debugfs.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240419123543.270-3-michal.wajdeczko@intel.com