Add SIO I/O scheduler

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	block/Kconfig.iosched
Add SIO I/O scheduler

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	block/Kconfig.iosched
SCHEDULER: Autogroup patch group by current user android UID instead of task ID