camerad: move camera exposure logic to CameraExposure Class

[deanlee]

Refactors the camera exposure logic by encapsulating related functions and variables into the new CameraExposure class. This update ensures that camera_qcom2.cc and camera_qcom2.h are focused solely on V4L2 camera-related operations.

The changes involve straightforward encapsulation, with the functionality of the code remaining unchanged to facilitate easier review.

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[adeebshihadeh]

trigger-jenkins

[deanlee]

has conflicts with master. closed.