chromebook: setup wireless clocks and power

The chromebook uses mwifiex_sdio for its wireless card.
We need to enable proper clocks and power regulators, so the device is properly detected.

Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>

Conflicts:
	arch/arm/boot/dts/exynos5250-cros-common.dtsi
	arch/arm/boot/dts/exynos5250-snow.dts