Add tuneables for Schedtune

[dontobi]

Hi

Can you add the following tuneables:

/dev/stune/schedtune.boost /dev/stune/schedtune.dynamic_boost /dev/stune/background/schedtune.boost /dev/stune/background/schedtune.dynamic_boost /dev/stune/foreground/schedtune.boost /dev/stune/foreground/schedtune.dynamic_boost /dev/stune/rt/schedtune.boost /dev/stune/rt/schedtune.dynamic_boost /dev/stune/top-app/schedtune.boost /dev/stune/top-app/schedtune.dynamic_boost

Thanks