drm/i915/gt: Fix SPDX license format

Header files need to declare the SPDX under /* ... */ style
comments at the beginning of the file.

Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com>
Reviewed-by: Krzysztof Karas <krzysztof.karas@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250314021225.11813-3-andi.shyti@linux.intel.com

Author: Andi Shyti

drivers/gpu/drm/i915/gt/intel_wopcm.h

@@ -1,6 +1,5 @@
+/* SPDX-License-Identifier: MIT */
 /*
- * SPDX-License-Identifier: MIT
- *
  * Copyright © 2017-2018 Intel Corporation
  */