machine-xilinx-default.inc: Setup UBOOT_SUFFIX for ZynqMP
machine-xilinx-default.inc: Setup UBOOT_SUFFIX for ZynqMP

* For ZynqMP U-Boot, the image suffix is '.bin'

Signed-off-by: Nathan Rossi <e1e6d173c6873c0ae2b831215d22380d293bb314@xilinx.com>

nathanrossi/meta-xilinx,Xilinx/meta-xilinx,nathanrossi/meta-xilinx,Xilinx/meta-xilinx,nathanrossi/meta-xilinx,nathanrossi/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx