add backlight support in textconf

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m fixes + add connector name and monitor edid support in textconf

Signed-off-by: Mattias Andrée <maandree@operamail.com>
support multiple backlight devices in textconf

Signed-off-by: Mattias Andrée <maandree@operamail.com>