sensor: lsm6ds: Do not enable Streaming for buses with no RTIO support

Ensure the corresponding bus enables RTIO (I2C, I3C or SPI) before
instantiating rtio-dependent elements. Otherwise, enabling it for
another bus (e.g: SPI_RTIO when the LSM6DS is also on I3C with no
I3C_RTIO) will cause a build-time failure.

Signed-off-by: Luis Ubieda <luisf@croxel.com>