Revert "cpufreq: to fix interactive cause kernel oops without BOOST enable"

This reverts commit 08dcb66ba2873c5ee440f671074603117d55f259.
CPUFREQ: fix NULL point cause kernel oops

For interactive, it should to creat "cpufreq" dir for itself.
Without this, system will call a NULL object, that should cause
kernel oops.

Change-Id: I5cd8620684c5543c8e92accdf301f46c531e2441
RK3288: update for power_LoadTest
includes:
1. GPU fix error on 500MHz, also ajusted voltage table
2. CPUFREQ underrun interactive, with load param ajusted
3. CPU ajust frequency table, for power save

Change-Id: I3bd4d9d68465881ffe79c2a5958b7177d95afa85