arm64: dts: renesas: Switch to upstream DT on Renesas R-Car X5H R8A78000

Enable OF_UPSTREAM to use upstream Linux kernel DT source as a base
for U-Boot control DT. Retain currently present parts of the DT which
are not yet part of upstream Linux kernel DT in -u-boot.dtsi files
until they get replaced by upstream equivalents. Add renesas/ prefix
to the DEFAULT_DEVICE_TREE as part of the switch.

Unused i2c2..i2c8 nodes have been removed, and will become available
once upstream Linux kernel DT adds those nodes.

The DRAM_RSV_SIZE has been updated to cover first 518 MiB of DRAM,
which are reserved for firmware and other use.

Note that all DT parts in -u-boot.dtsi are not considered stable DT
bindings and may change before they land in Linux kernel and become
stable DT ABI.

Signed-off-by: Marek Vasut <[email protected]>

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