ARM: dts: rmobile: Extract AVB node extras on V3M Eagle

The AVB node is not complete in Linux 4.17 DTs on V3M Eagle, pull the
AVB node extras into U-Boot specific DT until they hit mainline Linux,
to make syncing of DTs easier.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
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V2: Rebase on u-boot/master