Revert "omap2plus: cpufreq: fix cur_freq"

This reverts commit 2a8caf7e48d87085eca54d01edc133322899d31f.
omap2plus: cpufreq: fix frequency recalculation logic - finally
Intelli-Plug: Add sysfs toggle for screen-on-hotplug enable/disable

Multi-Core CPUs are meant for working with all cores and are optimized for balanced power consumption.

Example:

- A Dual-Core CPU running with both cores each at 400mhz needs less power than a Dual-Core CPU running only one core at 800mhz!
- Turning the secondary cores constantly on/off alse needs more power than saving it.

We only allow CPU1 to be turned off when device goes into suspend.
This is better way than using 'Dynamic Hotplug' which doesn't handle big tasks requesting the CPU, so all tasks have to be handled by one core only when device is in sleep. Intelli-Plug can turn the second (or any secondary) core(s) on if needed - even when the device is sleeping.

This new function can be toggled by userspace entry 'hotplug'