Make memcpy memmove

Bug: http://b/63992911
Test: Change BoardConfig.mk and compile for each variant
Change-Id: Ia0cc68d8e90e3316ddb2e9ff1555a009b6a0c5be
diff --git a/libc/arch-arm64/generic/bionic/memcpy.S b/libc/arch-arm64/generic/bionic/memcpy.S
index fc487d3..baadb92 100644
--- a/libc/arch-arm64/generic/bionic/memcpy.S
+++ b/libc/arch-arm64/generic/bionic/memcpy.S
@@ -30,6 +30,6 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(memcpy)
+ENTRY(__memcpy)
   #include "memcpy_base.S"
-END(memcpy)
+END(__memcpy)