xilinx: zynq: Enable fdt apply utility for zynq

Enables the FDT library (libfdt) overlay support for zynq platforms
to be able to use fdt apply command.

Signed-off-by: Raju Kumar Pothuraju <rajukumar.pothuraju@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/ab26dd186fb752b3d607e6160ae5baf6661d5de7.1688990179.git.michal.simek@amd.com
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