ARM: clocksource: moxart: documentation: Update device tree bindings document

1. describe compatible variable "Must be" instead of "Should be".
2. change description so it's from the point of view of the device

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
1 file changed