misc: add dynamic writeback interface
Before this patch, the deamon for flushing
dirty pages kicks in every 600 ms. This patch
changes the behaviour a little bit. While suspended
it flushes more pages (every 500 ms) and while the
the device is awake and in use it flushes only every
4 s to gain a little performance boost.

This is fully controllable;

echo 1 > /sys/devices/virtual/misc/writeback/writeback_enabled
(1 = On (default), 0 = off (and behaviour before this
patch).

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
Revert "cpufreq: interactive: stop unnecessary freq jumps - TEST"

This reverts commit 7e3d155579b39bf59d68cee2715a6d6cd8b413e8.
softirq derp