Revert "Revert "Remove incorrect android_atomic_...64 use.""

This reverts commit 9dc5c269f74ac76f62515e3d9558e67c6e63067d.
Adds a stdint.h include in case stdatomic.h stops including that.

Change-Id: If3dd1db1f1132c0f2dc1efb0a44617d3f36d7cfb
2 files changed