iio: gyro: bmg160_spi: add of_match_table

Add the missing of_match_table to bmg160_spi driver to enhance devicetree
compatibility.

Signed-off-by: Jun Yan <jerrysteve1101@gmail.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Link: https://patch.msgid.link/20250306145740.32687-1-jerrysteve1101@gmail.com


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