When a sensor that depends on an ADC is enabled in devicetree, enable
the ADC subsystem. ADC is roughly equivalent to a bus for these sensors
(the mechanism through which data is transferred), which had the same
conversion applied in #48707.
The same benefits apply here, namely removing the need for the following
pattern in board `.kconfig` files:
```
configdefault ADC
default y if SENSOR
```
Signed-off-by: Jordan Yates <jordan@embeint.com>
Add an input driver to read data from an analog device, such as a
thumbstick, connected to an ADC channel, and report it as an input
device.
Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>
