sched: set sched_smt_power_savings to 2, maybe i can get more battery savings through this, as from what i know, sched_mc_power_savings affect the load that a cpu core takes, while this affects the number of threads that a core will handle. hopefully both of these at 2 will bring about serious battery savings

Change-Id: I1de4073a75adc30578b8547cfe44e73e3c847bf9
Signed-off-by: zwliew <zhaoweiliew@gmail.com>