media: vimc: sensor: Use subdev active state

Store the active formats and crop rectangle in the subdevice active
state. This simplifies implementation of the format and selection
accessors, and allows using the v4l2_subdev_get_fmt() helper to
implement the .get_fmt() operation.

The active configuration that is used in the .process_frame() handler is
still stored in the vimc_sensor_device structure. The driver could
instead access the active state in the .process_frame() handler, but the
required locking could interfere with the real time constraints of the
frame processing. This data would be stored in registers in the
.s_stream() handler for real hardware, storing it in dedicated storage
thus mimics a real driver. To differentiate them from the rest of the
device private data, move the corresponding fields to a sub-structure of
vimc_sensor_device named hw.

Signed-off-by: Laurent Pinchart <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

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