clocksource: armada-370-xp: Use atomic access for shared registers
clocksource: armada-370-xp: Use atomic access for shared registers

Replace the driver-specific thread-safe shared register API
by the recently introduced atomic_io_clear_set().

Signed-off-by: Ezequiel Garcia <7248f52d8926fd82a5eb079a13afe9dd79e34c7a@free-electrons.com>
Signed-off-by: Daniel Lezcano <e9fa45941f2ebe89c1b9d6c5f339ab42eadb8567@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs