boards: arm: Enable arduino serial port on mimxrt1064_evk

Configures lpuart3 pinmuxes. This instance is attached to the Arduino
serial header pins and can be used for Bluetooth serial HCI with a
frdm_kw41z or other BLE controller shield.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
4 files changed