x86: Downgrade clock throttling thermal event critical error

Under CI testing, it is common for the cpus to overheat with the
continuous workloads and end up being throttled. As the cpus still
function, it is less of a critical error meriting urgent action, but an
expected yet significant condition (pr_note).

References: https://gitlab.freedesktop.org/drm/intel/-/issues/8031


Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Petri Latvala <petri.latvala@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>