drivers: pinctrl_nrf: Use S0D1 drive by default for TWI/TWIM pins

The default S0S1 drive setting is not suitable for TWI/TWIM pins.
Override it with S0D1 as for some SoCs (e.g. nRF52833) without
this the peripheral will not work properly.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>