drm/xe/vf: Use uc_fw_version to store the negotiated GuC ABI

drm/xe/vf: Use uc_fw_version to store the negotiated GuC ABI

Instead of using a VF-specific type, we can use the common uc_fw_version
structure. This also means that we can use the available macros to
compare ABI versions.

While at it, exit early from the bootstrap if this is not the first time
we're doing it and the version hasn't changed, so we don't end up
logging it multiple times.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lukasz Laguna <lukasz.laguna@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://lore.kernel.org/r/20250603235432.720833-9-daniele.ceraolospurio@intel.com