iio: adc: rtq6056: Add support for the whole RTQ6056 family

RTQ6053 and RTQ6059 are the same series of RTQ6056.

The respective differences with RTQ6056 are listed below
RTQ6053
- chip package type

RTQ6059
- Reduce the pinout for vbus sensing pin
- Some internal ADC scaling change

Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://lore.kernel.org/r/3541207c4727e3a76b9a3caf88ef812a4d47b764.1704676198.git.cy_huang@richtek.com


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