arm64: dts: marvell: espressobin: indicate dts version

The commit introducing ESPRESSObin variants didn't specify dts version,
and because of that they are treated by dtc as legacy ones. Fix that by
properly specifying version in each dts.

Fixes: 447b8789 ("arm64: dts: marvell: add ESPRESSObin variants")
Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>