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H A Dmorello-soc.dts67a8a5c92e7c65108b3cdf6f4f9dd2de7e22f3cd Thu Mar 24 16:14:28 UTC 2022 Andre Przywara <andre.przywara@arm.com> fix(morello): dts: fix stdout-path target

According to the DT spec, stdout-path must either start with the full
path to a node, or with an alias.
"soc_uart0" is neither of them, and consequently the Linux kernel
complains that it cannot find the root console device when just given
"earlycon" on the kernel command line:
===========
[ 0.000000] OF: fdt: earlycon: stdout-path soc_uart0 not found
===========

Use the already defined "serial0" alias to fix this and make "earlycon"
work in Linux.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Change-Id: Ie0ddb1909160c930af3831246f0140363bc0b5db