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SCIF0 has been enabled by the firmware, so it worked already. Still, add
the proper nodes to make it work in any case.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20210121110008.15894-3-wsa+renesas@sang-engineering.com

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>