ARM: rmobile: Add R-Car Generation 4 support

This adds R-Car Generation 4 (Gen4) support as Renesas ARM64 SoC.

In this version, reusing R-Car Gen3 lowlevel initialize routine [1]
and R-Car Gen3 memory map tables [2] .

[1] arch/arm/mach-rmobile/lowlevel_init_gen3.S
[2] arch/arm/mach-rmobile/memmap-gen3.c

Reviewed-by: Marek Vasut <[email protected]>
Signed-off-by: Hai Pham <[email protected]>
Signed-off-by: Marek Vasut <[email protected]>
[Marek: - Enable DTO support by default
        - Sort the Kconfig lists
	- Select RCAR_64 Kconfig option to pull in all the shared
	  Kconfig options with Gen3, and use where applicable to
	  deduplicate entries.
	- Fix reference [2] typo in commit message
	- Drop config options moved to Kconfig, rename rest to CFG_
	  accordingly to synchronize with upstream changes. Drop
	  removed CONFIG_VERY_BIG_RAM.
        - Move board size limit to arch/Kconfig
	- Move GICR_BASE to headers instead of common config]

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