staging:iio:cdc:ad7150: Add of_match_table

Rather than using the fallback path in the i2c subsystem and hoping
for no clashes across vendors, lets put in an explicit table for
matching.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Reviewed-by: Barry Song <song.bao.hua@hisilicon>
Link: https://lore.kernel.org/r/20210314181511.531414-21-jic23@kernel.org