Initial iyokan bringup

Signed-off-by: nobodyAtall <tsogkas@ceid.upatras.gr>
Fix mtd density for iyokan and probably other devices

Signed-off-by: nobodyAtall <tsogkas@ceid.upatras.gr>
Fix mango keyboard backlight

Signed-off-by: nobodyAtall <tsogkas@ceid.upatras.gr>