msm: cpufreq: sysfs for max screen off frequency - default 1026MHz

Thanks
@flar2

Source:
https://github.com/flar2/flo/commit/d1c7e6585eadd3924b79b22a263c933d41ea1548
ak_flo_defconfig: enable MSM_SLEEPER
msm: cpufreq: added low cpu clock frequencies
ak_flo_defconfig: enable LOW_CPUCLOCKS
msm: cpufreq: added ultra low (81Mhz) cpu clock frequencies
cfq-iosched: update tunables with mainline
sched: Add sysinterface for GENTLE_FAIR_SLEEPERS

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Kernel Version: AK.015.XGENESIS.FLO