Revert "drivers: staging: imageon configures ADV7611 chip"

This reverts commit b927d925e489484e5523b2d058745661dfc49ba1.

Conflicts:

	drivers/staging/Kconfig
	drivers/staging/Makefile

This patch remove imageon driver support.
Conflicts resolved.

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
configs:zynq base trd: Remove imageon driver support.

Remove CONFIG_VIDEO_IMAGEON entry.

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
dts: zynq base trd: Remove imageon dev node

Cleanup unused imageon dev node

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>