This initial GuC Relay ABI specification includes messages for ABI
version negotiation and to query values of runtime/fuse registers.

We will start handling those messages on the PF driver soon.
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240423180436.2089-2-michal.wajdeczko@intel.com