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As Icenowy rightfully assumed, the V831 SPI support covers the H6 as
well. The only difference was a slight deviation in the pinmux setup:
the H6 has the SPI0-CS on pin PC5, the V831 on pin PC1.

Just add the right SoC ID and tweak the pinmux setup to enable it.

Tested on a Pine H64.
Signed-off-by: Andre Przywara <osp@andrep.de>