drm/i915/guc: Update header guard name of intel_guc_submission.h

While renaming i915_guc_submission.h to intel_guc_submission.h, update of
header guard name to _INTEL_GUC_SUBMISSION_H_ was missed.

References: a269574 (drm/i915/guc: Rename i915_guc_submission.c|h to intel_guc_submission.c|h)
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1511511650-13756-1-git-send-email-sagar.a.kamble@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_guc_submission.h

@@ -22,8 +22,8 @@
  *
  */
 
-#ifndef _I915_GUC_SUBMISSION_H_
-#define _I915_GUC_SUBMISSION_H_
+#ifndef _INTEL_GUC_SUBMISSION_H_
+#define _INTEL_GUC_SUBMISSION_H_
 
 #include <linux/spinlock.h>