libcutils: fix atomic_memory_store_barrier

dmb isht is not a valid instruction, fix it to be dmb ishst
(data memory barrier, inner shareable, on writes).

Change-Id: I98723ccd8618b7863cb55da53dc29b979c9905a5
diff --git a/include/cutils/atomic-aarch64.h b/include/cutils/atomic-aarch64.h
index 927379f..4562ad0 100644
--- a/include/cutils/atomic-aarch64.h
+++ b/include/cutils/atomic-aarch64.h
@@ -66,7 +66,7 @@
 extern ANDROID_ATOMIC_INLINE
 void android_memory_store_barrier(void)
 {
-    __asm__ __volatile__ ("dmb isht" : : : "memory");
+    __asm__ __volatile__ ("dmb ishst" : : : "memory");
 }
 #endif