Add support for RSR941 touchscreen

Signed-off-by: Carlo Caione <carlo@caione.org>
Preliminary fix for '#6: CPU cores appear to lock' issue.

A new defconfig is added with a tailored configuration to avoid the
blocking issue.

Signed-off-by: Carlo Caione <carlo@caione.org>
Enable ttyS1 and ttyS2 (connector J14)

Signed-off-by: Carlo Caione <carlo@caione.org>
Added in configuration for USB to Serial converters
wifi: add wifi driver

Signed-off-by: Carlo Caione <carlo@caione.org>