Both platforms using the MTU (Nomadik and Ux500) have now been
converted to use device tree exclusively, thus let us delete
this platform data header and make this driver a fully
self-contained DT-only driver.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Lee Jones <lee.jones@linaro.org>
Acked-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>