Sensors: Extend Support for fetching Multiple Sensor Channels of same type

[jilaypandya]

Context:
Certain Sensors can monitor multiple sensor channels of same type, for instance, lets take ambient temperature

Current Scenario:

1. In the driver you would fetch all possible instances of ambient temperatures made available by that sensor
2. The user of the driver would have to pass an appropriate sensor_value[number_of_available_instances]
3. This would cause unwanted calls taking place on bus level.

Solution:

• Would it be possible to extend the sensor api in order to pass an auxiliary parameter to select between various ambient temperatures(just as an example, this could be any sensor_channel)?

  OR

• Would end user have to use the data_ptr – Pointer to the device’s private data eventually and instantiate the sensor_device accordingly in order to pass this auxiliary information?