3.11: update to 3.11rc2

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Added IIO to Kconfig

Took a headache to figure out why the ADC driver isn't loading.
These lines are from the previous 3.8 Kconfig..
Merge branch '3.11' of github.com:beagleboard/kernel into 3.11