Revert "Add optimized AArch64 versions of bcopy and wmemmove based on memmove"

This reverts commit 8167dd7cb98e87ffe9b40e4993c330b244ca2234.

For some reason I thought the bcopy change was bzero. The bcopy code doesn't pass our tests, so reverting until I can figure out what's wrong.

Change-Id: Id89fe959ea5105cd58dff6bba8d91a30cc4bcb07
diff --git a/libc/Android.mk b/libc/Android.mk
index e260871..d8c8f63 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -256,6 +256,7 @@
     upstream-freebsd/lib/libc/string/wcstok.c \
     upstream-freebsd/lib/libc/string/wmemchr.c \
     upstream-freebsd/lib/libc/string/wmemcpy.c \
+    upstream-freebsd/lib/libc/string/wmemmove.c \
     upstream-freebsd/lib/libc/string/wmemset.c \
 
 libc_upstream_netbsd_src_files := \