ARM: dts: imx: Add i.MXRT1050-EVK support

The NXP i.MXRT1050 Evaluation Kit (EVK) provides a platform for rapid
evaluation of the i.MXRT, which features NXP's implementation of the Arm
Cortex-M7 core.

The EVK provides 32 MB SDRAM, 64 MB Quad SPI flash, Micro SD card socket,
USB 2.0 OTG.

This patch aims to support the preliminary booting up features
as follows:
GPIO
LPUART
SD/MMC

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
[Jesse: Add clock-parents, edma, usdhc, anatop, remove old pinctl]
Signed-off-by: Shawn Guo <shawnguo@kernel.org>