gen-image: Add generation of HGT reference frame

Add a new histogram type HGT to be able to compute HGT histogram frame
from RGB data. This is needed to test the HGT module together with the
HST module in the VSP pipeline to convert a image from RGB to HSV.

This also includes a new command line option to be able to specify the
user configuration of the HGT hue areas. This is needed to verify that the
HGT driver can operate with different hue area configurations.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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