graphics/drm-515-kmod: Update to drm_v5.15.25_4

i915: Disable GuC by default on gen12+. It's known to be broken for us
and upstream started to enable it by default for those platform.

Sponsored by: Beckhoff Automation GmbH & Co. KG

(cherry picked from commit f27d43c5c286425ff3b625fae00028fd8dc1771d)