[FEATURE] Add Zynq FSBL cmake project

The Zynq first stage bootloader (FSBL) uses boot.bin file placed
on a FAT32 SDCARD initializing host and pcp binaries in the DDR memory.

The bootloader code is part of Xilinx install directory and is
imported and built through cmake for openPOWERLINK demos on Zynq.

Change-Id: Ia68440e81c35029a6cb3b3ba33f57b501a1289a1
Signed-off-by: Joerg Zelenka <joerg.zelenka@br-automation.com>