boards: arm: Configure frdm_k64f Arduino D9 pin as gpio

Configures the pinmux for the Arduino D9 pin to allow using it as a
gpio. This is needed by the adafruit_2_8_tft_touch_v2 shield for
cmd-data-gpios.

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