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 <[email protected]>