pico-imx6ul: Enable rfkill for picoimx board for Bluetooth

Assign the BT_REG_ON pin to rfkill.
Disable lcdif in DTS due the BT_REG_ON reuse in it.

Change-Id: Ib4b527793812216a889836aea361cc0a3362291a
Signed-off-by: Haoran Wang <Haoran.Wang@freescale.com>
1 file changed