arm: dts: zynq-zc706-vdf: Remove the dre property from vdma node.

Remove the dre property from vdma node.
arm: dts: zynq-zc706-vdf: Add properties to the scaler node

Add properties to the scaler node.
media: xilinx: scaler: Add algorithm for coefficients

Add fixed-point algorithm to compute coefficients which replaces
hardcoded tables.