intelli_plug: move to its own directory. It's been cross platform for a while

intelli_plug driver has been working on OMAP44xx, TEGRA 3, Exynos and
MSM Krait/Cortex multi-core SOCs.  So it doesn't make sense to patch on
a per SOC basis, move it to its own ARM platform independent folder so
patches can apply to all supported ARM platforms

Signed-off-by: Paul Reioux <reioux@gmail.com>