uboot-phytec

arm64: zynqmp: Sync up license with mainline kernel

Mainline Linux kernel has adopted SPDX header license in a different
format then was used before. This patch is syncing it up.

Also update years in License text and remove Nathalie's email because it
is no longer valid.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>