libc: Import from TF-A

Based on arm-trusted-firware commit 873e394b3bf93214a441f9f98237b58fbbea55aa

Change-Id: I510e092f2b9ff333e9461bdde8d80ed1fab1460c
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
diff --git a/lib/libc/strlen.c b/lib/libc/strlen.c
new file mode 100644
index 0000000..3c27630
--- /dev/null
+++ b/lib/libc/strlen.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+
+size_t strlen(const char *s)
+{
+	const char *cursor = s;
+
+	while (*cursor)
+		cursor++;
+
+	return cursor - s;
+}