msm: Add msm_hotplug driver

Neo:

* Hotplug driver by myfluxi turning cores on/off as per the load
* mpdecision needs to be disabled in ramdisk to avoid interference

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
defconfig: enable msm_hotplug driver
cpufreq: force cpuN policy to match cpu0 when changing freq or gov

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>