cgroup/timer_slack: fix cgroup permission errors

Since the common mounting of cpu and timer_slack into /dev/cpuctl
in commit
https://github.com/boype/kernel_tuna_jb42/commit/f23ab456002c2d3b416260862dbfdb82b031a450
the Android OS cannot move processes across cgoups anymore:

    W/SchedPolicy( 1180): add_tid_to_cgroup failed to write '5949'
    (Permission denied); policy=0

Fix this by implementing an 'allow_attach' handler, according to
this commit:
https://github.com/boype/kernel_tuna_jb42/commit/bb5b603036b99d80527b222dc98eba4ee8341020

Signed-off-by: Boy Petersen <boypetersen@gmail.com>
cpufreq: ondemandplus: handle speed up and down in the realtime task

Original commit for interactive governor by Todd Poynor:
https://android.googlesource.com/kernel/common.git/+/f8aa05d96a0d18416d2627c493f7dc9bc5324901
cpufreq: ondemandplus: pin timers to associated CPU

Based on interactive governor commit by Todd Poynor:
https://android.googlesource.com/kernel/common.git/+/430d3d4539a0d441679ca32cc7c3876f97a07da6
tuna_defconfig: MIRAGE V2.5

Change-Id: I74110b54800b223a1304afdcffa05fd4e53daabb