drm/i915/uc: Move uC debugfs to its own folder under GT

uC is a component of the GT, so it makes sense for the uC debugfs files
to be in the GT folder. A subfolder has been used to keep the same
structure we have for the code.

v2: use intel_* prefix (Jani), rebase on new gt_debugfs_register_files,
    fix permissions for writable debugfs files.

v3: Rename files (Michal), remove blank line (Jani), fix sparse warns.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Tony Ye <tony.ye@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com> #v2
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200326181121.16869-6-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.h

@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2020 Intel Corporation
+ */
+
+#ifndef DEBUGFS_GUC_H
+#define DEBUGFS_GUC_H
+
+struct intel_guc;
+struct dentry;
+
+void intel_guc_debugfs_register(struct intel_guc *guc, struct dentry *root);
+
+#endif /* DEBUGFS_GUC_H */