ARM: dts: kswitch-d10: use open drain mode for coma-mode pins

The driver use the coma-mode pins as open-drain. Flag them in the device
tree accordingly. This avoids the following error:
[   14.114180] gpio-2007 (coma-mode): enforced open drain please flag it properly in DT/ACPI DSDT/board file

Fixes: 46a9556d ("ARM: dts: kswitch-d10: enable networking")
Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220704150808.1104295-1-michael@walle.cc