arm64: zynqmp: Add missing zynq_board_read_rom_ethaddr() prototype

Add missing zynq_board_read_rom_ethaddr() prototype reported by sparse.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
1 file changed