v4l: xilinx: Add HLS core driver

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Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[HACK] v4l: xilinx: Program HLS filter coefficients.

Program filter coefficients for now till
we get v4l2 user plugin implemented.

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
zynq: config: add vdf defconfig

enable sobel driver
zynq: dt: add devicetrees for base trd and vdf designs