ARM: Change dmb domain for bionic_atomic_barrier()

This patch changes the domain that the memory barrier operates on. Assumes
that the scope of bionic_atomic_barrier() does not include device memory,
memory shared with the GPU or any other memory external to the processor
cluster.

Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>

Conflicts:
	libc/private/bionic_atomic_arm.h
	libc/private/bionic_atomic_gcc_builtin.h

Change-Id: I291e741c98a64c86f3a3cf99811bbf1e714ac9aa