Espresso10: Enable Overclock and voltage control

Change-Id: Idb45433a159ad46b466de5c66a51862bae110d82
sgxfreq: add sysfs interface to store frequency limit

Change-Id: I05dfd89c1db4d0b1948ad8101194430efc75ff84
sgxfreq: limit frequency to default on boot

Change-Id: Ibd6962a71fab7790f3dadfe2a4b31b849b9c3424
Merge "Espresso10: Enable Overclock and voltage control" into kk4.4