EDAC: Carve out debugfs functionality

... into a separate compilation unit and drop a couple of
CONFIG_EDAC_DEBUG ifdefferies. Rename edac_create_debug_nodes() to
edac_create_debugfs_nodes(), while at it.

No functionality change.

Cc: <linux-edac@vger.kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
diff --git a/drivers/edac/edac_module.h b/drivers/edac/edac_module.h
index 26ecc52..79a6c6e 100644
--- a/drivers/edac/edac_module.h
+++ b/drivers/edac/edac_module.h
@@ -63,12 +63,14 @@
 #ifdef CONFIG_EDAC_DEBUG
 int edac_debugfs_init(void);
 void edac_debugfs_exit(void);
+int edac_create_debugfs_nodes(struct mem_ctl_info *mci);
 #else
 static inline int edac_debugfs_init(void)
 {
 	return -ENODEV;
 }
 static inline void edac_debugfs_exit(void) {}
+static inline int edac_create_debugfs_nodes(struct mem_ctl_info *mci) { return 0; }
 #endif
 
 /*