linux-phytec-fsl

ARM: dts: add PMU to the NHK15 device tree

The so-called Nomadik Power Mangament Unit is actually a set
of some power management registers and some miscellaneous
system control stuff like muxing of entire hardware units.
Add this as a system controller.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>