We shouldn't need anything from the GuC submission code until we
finish GuC initialization in post hwconfig step.

While around add diagnostic message if we fail uC init.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240510203810.1952-3-michal.wajdeczko@intel.com