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Some device tree users like to find a pointer to the standard serial
console in the device tree, in the "stdout-path" property of the /chosen
node.

Add the location of the Mini UART in that property, so that DT users are
happy, for instance Linux' earlycon detection.

Change-Id: I178e55016e5640de5ab0bc6e061944bd3583ea96
Signed-off-by: Andre Przywara <andre.przywara@arm.com>