Use VDSO for clock_gettime(2) and gettimeofday(2).

Bug: 15387103
Change-Id: Ifc3608ea65060c1dc38120b10b6e79874f182a36
diff --git a/libc/arch-arm64/syscalls/__gettimeofday.S b/libc/arch-arm64/syscalls/__gettimeofday.S
new file mode 100644
index 0000000..6582c49
--- /dev/null
+++ b/libc/arch-arm64/syscalls/__gettimeofday.S
@@ -0,0 +1,15 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(__gettimeofday)
+    mov     x8, __NR_gettimeofday
+    svc     #0
+
+    cmn     x0, #(MAX_ERRNO + 1)
+    cneg    x0, x0, hi
+    b.hi    __set_errno
+
+    ret
+END(__gettimeofday)
+.hidden __gettimeofday