The rzg2_beacon_defconfig creates an image for RZ/G2[MNH] and
as such creates three different device trees and each of them
have a corresponding -u-boot.dtsi file which are basically
copies of each other. Create a common include file to be
referenced by each of the respective board-u-boot.dtsi files
to reduce duplicate code and simplify support going forward.
This also restores some lost functionality from the device
tree re-sync and updates the MAINTAINER file to include all
beacon-renesom device tree files.
Signed-off-by: Adam Ford <aford173@gmail.com>
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