arm64: Add read64() and write64()

Change-Id: I89cf4b996405af616f54cf2d9fabd4e258352b03
Signed-off-by: David Hendricks <dhendricks@fb.com>
Reviewed-on: https://review.coreboot.org/23036
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed