The NRF driver doesn't utilize the Kconfig symbol for per instance I2C
so we can remove setting that in the conf file.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
The options selecting nRF drivers are now enabled by default when
an nRF SoC is selected as the build target.
The options selecting given hardware instances are now enabled at
the board level.
Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
