add missed ir-receiver and ir_rx pinctl nodes to rk3399-khadas-edge
Khadas Edge board uses gpio-ir-receiver on RK_PB6 gpio

Signed-off-by: Artem Lapkin <art@khadas.com>
Link: https://lore.kernel.org/r/20200923130823.1612533-3-art@khadas.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>