iio: adc: tsc2046: silent spi_device_id warning

Add spi_device_id to silent following kernel runtime warning:
"SPI driver tsc2046 has no spi_device_id for ti,tsc2046e-adc".

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220904100203.3614502-3-o.rempel@pengutronix.de


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>