iio: imu: st_lsm6dsx: don't always auto-enable I2C, I3C and SPI interface drivers

iio: imu: st_lsm6dsx: don't always auto-enable I2C, I3C and SPI interface drivers

This patch makes I2C, I3C and SPI interface drivers for ST lsm6dsx
individually selectable via Kconfig.

The default is kept unchanged - I2C, I3C and SPI interface drivers are
still selected by default if the corresponding bus support is available.

However, the patch makes it possible to explicitly disable drivers
that are not needed for a particular target.

Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Link: https://patch.msgid.link/20241203-lsm6dsx-v1-1-6d7893443bc8@geanix.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>