EDAC, pnd2_edac: Fix !EDAC_DEBUG build

Provide debugfs function stubs when EDAC_DEBUG is not enabled so that we
don't fail the build:

  drivers/edac/pnd2_edac.c: In function ‘pnd2_init’:
  drivers/edac/pnd2_edac.c:1521:2: error: implicit declaration of function ‘setup_pnd2_debug’ [-Werror=implicit-function-declaration]
    setup_pnd2_debug();
    ^
  drivers/edac/pnd2_edac.c: In function ‘pnd2_exit’:
  drivers/edac/pnd2_edac.c:1529:2: error: implicit declaration of function ‘teardown_pnd2_debug’ [-Werror=implicit-function-declaration]
    teardown_pnd2_debug();
    ^

Signed-off-by: Borislav Petkov <bp@suse.de>

drivers/edac/pnd2_edac.c

@@ -1435,7 +1435,11 @@ static void teardown_pnd2_debug(void)
 {
 	debugfs_remove_recursive(pnd2_test);
 }
-#endif
+#else
+static void setup_pnd2_debug(void)	{}
+static void teardown_pnd2_debug(void)	{}
+#endif /* CONFIG_EDAC_DEBUG */
+
 
 static int pnd2_probe(void)
 {