libipa: Add CameraSensorHelper for IMX258

Extend the CameraSensorHelper factory with support for the IMX258
sensor found in the Nautilus Chromebook.

The values are read by manually tweaking the IMX258 kernel driver.
The IMX258 kernel driver hints that the sensor may be compatible
with the MIPI CCS specification, as the register set matches.
The values for analog gain constants are obtained by reading the
register indexes, corresponding to the analog gain constants, as
mentioned in MIPI CCS v1.1 specification.

The values have further been confirmed by Dave Stevenson as being
those specified in the datasheet.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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