blu_plug: Dynamic hotplug driver for hammerhead

Based on dyn_hotplug by stratosk
Improvements, fixes, changes and ported to hammerhead by eng.stk <eng.stk@sapo.pt>

Signed-off-by: engstk <eng.stk@sapo.pt>

Conflicts:
	arch/arm/mach-msm/Kconfig
	arch/arm/mach-msm/Makefile