drm/i915/dmc: define firmware URL locally

Avoid the dependency on intel_uc_fw.h, and allow removal of xe compat
intel_uc_fw.h. If there needs to be duplication of the URL, at least
have the duplication in a sensible way.

Cc: Lucas De Marchi <[e-mail]>
Reviewed-by: Lucas De Marchi <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/159[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

drivers/gpu/drm/i915/display/intel_dmc.c

···
  * low-power state and comes back to normal.
  */
 
+#define INTEL_DMC_FIRMWARE_URL "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git"
+
 enum intel_dmc_id {
 	DMC_FW_MAIN = 0,
 	DMC_FW_PIPEA,
···
 			   " Disabling runtime power management.\n",
 			   dmc->fw_path);
 		drm_notice(&i915->drm, "DMC firmware homepage: %s",
-			   INTEL_UC_FIRMWARE_URL);
+			   INTEL_DMC_FIRMWARE_URL);
 	}
 
 	release_firmware(fw);

drivers/gpu/drm/xe/compat-i915-headers/i915_drv.h

···
 #include "i915_utils.h"
 #include "intel_gt_types.h"
 #include "intel_step.h"
-#include "intel_uc_fw.h"
 #include "intel_uncore.h"
 #include "intel_runtime_pm.h"
 #include <linux/pm_runtime.h>

drivers/gpu/drm/xe/compat-i915-headers/intel_uc_fw.h

···
-/* SPDX-License-Identifier: MIT */
-/*
- * Copyright © 2023 Intel Corporation
- */
-
-#ifndef _INTEL_UC_FW_H_
-#define _INTEL_UC_FW_H_
-
-#define INTEL_UC_FIRMWARE_URL "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git"
-
-#endif