ARM: ux500: move the HREFv60plus IPGPIO pins to device tree

Move the control of muxing and enabling the IPGPIO (image
processor GPIO) from the static set-up to the device tree.
Use a hog as we have no device for the flash controller yet.

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

diff --cc arch/arm/boot/dts/ste-hrefv60plus.dtsi
Simple merge

diff --cc arch/arm/mach-ux500/board-mop500-pins.c
Simple merge