ARM: dts: imx: Switch Engicam boards to use SPDX identifier
Adopt the SPDX license identifier headers to ease license compliance
management.
Also added Engicam Copyright on missing files.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
authored by