kbuild-3.6: select MDIO for Atheros ethernet devices

This could be useful for not-yet-mainlined alx driver.
toi-3.10: fix kthread_freezable_should_stop() usage
Merge branch 'toi-3.10' into pf-3.10
Merge branch 'fixes-3.9' into fixes-3.10
Merge branch 'fixes-3.10' into pf-3.10