cpufreq: Introduce Uberdemand

* Ondemand CPU governor with 2nd phase tunable since I missed that feature. Cap is set at 1728 MHz which seems to do well.

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	drivers/cpufreq/Makefile
uberdemand: simplify code

* Or in otherwords overhaul the whole thing because there are lots of things I don't care for.

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Defconfig: Enable Uberdemand