style(xilinx): fix AMD copyright format

There is missing comma in copyright line. It is better to have all
Copyrights align to the same style that's why fix it.

Change-Id: Ifc04b474e1a172a7243b073d944007cf17d76e87
Signed-off-by: Michal Simek <michal.simek@amd.com>
9 files changed