platform_drv & exynos5: provide HDMI switches

ref #796
framebuffer: support HDMI@1920x1080p on exynos5

ref #796
fb test: support exynos5

ref #796
fb test: view multiple pictures

ref #796
arndale: specs to enable demo scenario

ref #796
fb & exynos5: avoid USB HID problems with FOC

USB HID gets stuck due to strange kernel error
as HDMI starts simulatnously. This workaround
delays HDMI init by a second (only in case we
build for Exynos5 & FOC with USB) to let
scenarious like demo get their USB HID started
without much CPU load.

ref #796
demo: support exynos5

fix #796