omap4-common: disable hotplug cpu-governor

The hotplug-governor occasionally deadlocks the system_server
while writing to sysfs-files on wake-up from sleep, disable it
for now.

Change-Id: I6f4e651cd1182dd6055976e257ae0d54b2d1aff5
merge remote

Change-Id: I4bb016b17a29adfcb3b5e1f71162dfe5ba1848c2