[PATCH] imx8mn-ddr4-evk-u-boot: Fix broken boot

[sbabic at denx.de]

> When the imx8mm.dtsi file was pulled in from Linux, the UARTs
> were moved into an spba sub-node which wasn't being included
> in the SPL device tree.  This meant the references to the UART
> weren't being handled properly and when booting the system would
> constantly reboot.  Fix this by adding the spba node to the spl
> device tree to restore normal booting.
> Based on the patch from Adam Ford for the imx8mn-beacon-kit-u-boot
> board.
> Fixes: 4e5114daf9eb ("imx8mn: synchronise device tree with linux")
> Signed-off-by: Fabio Estevam <festevam at denx.de>
> Reviewed-by: Michael Trimarchi <michael at amarulasolutions.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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