ARM: dts: fix spdif pinmux configuration

The spdif pinmux configuration must be connected to the spdif device to
take effect, not the spdif-transmitter.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc arch/arm/boot/dts/imx6dl-hummingboard.dts
Simple merge

diff --cc arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
Simple merge