Add SIO scheduler

Signed-off-by: Dan Trifan <jimsth@gmail.com>
defconfig: enable SIO scheduler

Signed-off-by: Dan Trifan <jimsth@gmail.com>
Add config option to enable/disable Link time optimization

Signed-off-by: Dan Trifan <jimsth@gmail.com>
defconfig: enable  link time optimization

Signed-off-by: Dan Trifan <jimsth@gmail.com>