iio: gyro: list adis16137 in Kconfig description

The adis16136 driver also supports the adis16137 model, but it is not
mentioned in the Kconfig help. Add it to the description in Kconfig.

Signed-off-by: Yo-Jung Lin (Leo) <0xff07@gmail.com>
Link: https://patch.msgid.link/20241019034213.429464-1-0xff07@gmail.com


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