arm64: dts: freescale: imx8mp-toradex-smarc: enable hdmi_pai device

arm64: dts: freescale: imx8mp-toradex-smarc: enable hdmi_pai device

Enable the hdmi_pai device on the Toradex SMARC iMX8M Plus Development
boards.

The hdmi_pai device, together with aud2htx module, hdmi_pai and hdmi
controller compose the HDMI audio pipeline.

See commit b21f87b8322f ("arm64: dts: imx8mp-evk: enable hdmi_pai
device") for the equivalent change on the NXP i.MX8MP EVK board.

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>