ipa: Create a camera sensor helper class

For various sensor operations, it may be needed to do sensor specific
computations, like analogue gain or vertical blanking.

This commit introduces a new camera sensor helper in libipa which aims
to solve this specific issue.
It is based on the MIPI alliance Specification for Camera Command Set
and implements, for now, only the analogue "Global gain" mode.
Setting analogue gain for a specific sensor is not a straightforward
operation, as one needs to know how the gain is calculated for it.

Three helpers are created in this patch: imx219, ov5670 and ov5693.

Adding a new sensor is pretty straightforward as one only needs to
implement the sub-class for it and register that class to the
CameraSensorHelperFactory.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

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