arm64: dts: freescale: add Toradex SMARC iMX8MP

Add DT support for Toradex SMARC iMX8MP SoM and Toradex SMARC Development
carrier board.

Link: https://www.toradex.com/computer-on-modules/smarc-arm-family/nxp-imx-8m-plus
Link: https://www.toradex.com/products/carrier-board/smarc-development-board-kit


Co-developed-by: Hiago De Franco <hiago.franco@toradex.com>
Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Signed-off-by: Vitor Soares <vitor.soares@toradex.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>