lib/libc/aarch64/string: add bcopy & bzero wrapper

This patch enabled usage of SIMD enhanced functions to implement
bcopy and bzero.

Tested by:	fuz (exprun)
Reviewed by:	fuz, emaste
Sponsored by:	Google LLC (GSoC 2024)
PR:		281175
Differential Revision: https://reviews.freebsd.org/D46459

lib/libc/aarch64/string/Makefile.inc

@@ -30,7 +30,9 @@ MDSRCS+= \
 	memccpy.S \
 	strncat.c \
 	strlcat.c \
-	strlen.S
+	strlen.S \
+	bcopy.c \
+	bzero.c
 
 #
 # Add the above functions. Generate an asm file that includes the needed

lib/libc/aarch64/string/bcopy.c

@@ -0,0 +1,14 @@
+/*-
+ * Public domain.
+ */
+
+#include <string.h>
+
+#undef bcopy	/* _FORTIFY_SOURCE */
+
+void
+bcopy(const void *src, void *dst, size_t len)
+{
+
+	memmove(dst, src, len);
+}

lib/libc/aarch64/string/bzero.c

@@ -0,0 +1,14 @@
+/*-
+ * Public domain.
+ */
+
+#include <string.h>
+
+#undef bzero	/* _FORTIFY_SOURCE */
+
+void
+bzero(void *b, size_t len)
+{
+
+	memset(b, 0, len);
+}