Enable -Wshadow always

Variable shadowing is, according to the C standard, permitted and valid
behaviour. However, allowing a local variable to take the same name as a
global one can cause confusion and can make refactoring and bug hunting
more difficult.

This patch moves -Wshadow from WARNING2 into the general warning group
so it is always used. It also fixes all warnings that this introduces
by simply renaming the local variable to a new name

Change-Id: I6b71bdce6580c6e58b5e0b41e4704ab0aa38576e
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>
diff --git a/plat/layerscape/common/ns_access.c b/plat/layerscape/common/ns_access.c
index b84fdbd..9717c72 100644
--- a/plat/layerscape/common/ns_access.c
+++ b/plat/layerscape/common/ns_access.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -13,7 +13,7 @@
 
 #include "ns_access.h"
 
-static void enable_devices_ns_access(struct csu_ns_dev *ns_dev, uint32_t num)
+static void enable_devices_ns_access(struct csu_ns_dev *_ns_dev, uint32_t num)
 {
 	uint32_t *base = (uint32_t *)CONFIG_SYS_FSL_CSU_ADDR;
 	uint32_t *reg;
@@ -21,14 +21,14 @@
 	int i;
 
 	for (i = 0; i < num; i++) {
-		reg = base + ns_dev[i].ind / 2;
+		reg = base + _ns_dev[i].ind / 2;
 		val = be32toh(mmio_read_32((uintptr_t)reg));
-		if (ns_dev[i].ind % 2 == 0) {
+		if (_ns_dev[i].ind % 2 == 0) {
 			val &= 0x0000ffff;
-			val |= ns_dev[i].val << 16;
+			val |= _ns_dev[i].val << 16;
 		} else {
 			val &= 0xffff0000;
-			val |= ns_dev[i].val;
+			val |= _ns_dev[i].val;
 		}
 		mmio_write_32((uintptr_t)reg, htobe32(val));
 	}