libc: Adapt strlcpy to this codebase

Change-Id: I2f5f64aaf90caae936510e1179392a8835f493e0
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/include/lib/libc/string.h b/include/lib/libc/string.h
index 3c8e3b6..ee6eeac 100644
--- a/include/lib/libc/string.h
+++ b/include/lib/libc/string.h
@@ -28,5 +28,6 @@
 size_t strlen(const char *s);
 size_t strnlen(const char *s, size_t maxlen);
 char *strrchr(const char *p, int ch);
+size_t strlcpy(char * dst, const char * src, size_t dsize);
 
 #endif /* STRING_H */