Add U-Boot DT extras for each SoC and board. This marks the required nodes with u-boot,dm-pre-reloc to start clock and PRR early on while avoiding modification of the DTs imported from Linux. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>