AM43xx devices have an extra MUX_MODE for certain pins.
Updating dt include to have MUX_MODE8 which maps to 0x8.
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Benoit Cousson <bcousson@baylibre.com>