iio: Kconfig: ad8366: add entry for HMC1119 chip

The change is mostly cosmetic. When looking into the menuconfig help of the
ad8366 driver, the HMC1119 chip should also show up (since the driver
supports it).

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>