ARM: dts: add missing ux500 device trees

This adds hrefprev60, hrefv60plus and ccu9540 to device trees compiled
during build.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>