libc: Cleanup remaining files

The existing files had some style problems that this patch fixes.

Change-Id: I794e0d96e52f8da0ffa0d70a41f36c4432b4e563
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/lib/libc/libc.mk b/lib/libc/libc.mk
index 022e6bf..575a2aa 100644
--- a/lib/libc/libc.mk
+++ b/lib/libc/libc.mk
@@ -8,7 +8,11 @@
 			abort.c				\
 			assert.c			\
 			exit.c				\
-			mem.c				\
+			memchr.c			\
+			memcmp.c			\
+			memcpy.c			\
+			memmove.c			\
+			memset.c			\
 			printf.c			\
 			putchar.c			\
 			puts.c				\