libcec: temporary disable imx6 support, needs a fixed kernel driver

Signed-off-by: Stephan Raue <stephan@openelec.tv>
projects/Cuboxi/linux: switch to 'ondemand', cleanup kernel config

Signed-off-by: Stephan Raue <stephan@openelec.tv>
wlan-firmware: update to wlan-firmware-0.0.20

Signed-off-by: Stephan Raue <stephan@openelec.tv>