drm/i915/uc: Add params for specifying firmware

`guc_firmware_path` and `huc_firmware_path` module parameters are added.

Using the parameter disables version checks and loads desired firmware
instead of the default one.

v2: make params unsafe && notice about disabled fw check (J. Lahtinen)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index eaa2b75..c31f05a 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -356,8 +356,10 @@ void intel_uc_prepare_fw(struct drm_i915_private *dev_priv,
 		goto fail;
 	}
 
-	if (uc_fw->major_ver_found != uc_fw->major_ver_wanted ||
-	    uc_fw->minor_ver_found < uc_fw->minor_ver_wanted) {
+	if (uc_fw->major_ver_wanted == 0 && uc_fw->minor_ver_wanted == 0) {
+		DRM_NOTE("Skipping uC firmware version check\n");
+	} else if (uc_fw->major_ver_found != uc_fw->major_ver_wanted ||
+		   uc_fw->minor_ver_found < uc_fw->minor_ver_wanted) {
 		DRM_NOTE("uC firmware version %d.%d, required %d.%d\n",
 			uc_fw->major_ver_found, uc_fw->minor_ver_found,
 			uc_fw->major_ver_wanted, uc_fw->minor_ver_wanted);