8. ST VGXY61 camera sensor driver

The ST VGXY61 driver implements the following controls:

8.1. V4L2_CID_HDR_SENSOR_MODE

Change the sensor HDR mode. A HDR picture is obtained by merging two captures of the same scene using two different exposure periods.

HDR linearize	The merger outputs a long exposure capture as long as it is not saturated.
HDR subtraction	This involves subtracting the short exposure frame from the long exposure frame.
No HDR	This mode is used for standard dynamic range (SDR) exposures.