ARM: uniphier: add PH1-LD20 SoC support

arch/arm/mach-uniphier/Kconfig

arch/arm/mach-uniphier/Makefile

arch/arm/mach-uniphier/arm64/Makefile

arch/arm/mach-uniphier/arm64/arm-cci500.c

arch/arm/mach-uniphier/arm64/mem_map.c

arch/arm/mach-uniphier/arm64/smp.S

arch/arm/mach-uniphier/arm64/smp_kick_cpus.c

arch/arm/mach-uniphier/arm64/timer.c

arch/arm/mach-uniphier/board_common.c

arch/arm/mach-uniphier/board_early_init_f.c

arch/arm/mach-uniphier/boards.c

arch/arm/mach-uniphier/boot-mode/Makefile

arch/arm/mach-uniphier/boot-mode/boot-device.h

arch/arm/mach-uniphier/boot-mode/boot-mode-ld20.c

arch/arm/mach-uniphier/boot-mode/boot-mode.c

arch/arm/mach-uniphier/boot-mode/cmd_pinmon.c

arch/arm/mach-uniphier/clk/Makefile

arch/arm/mach-uniphier/clk/clk-ld20.c

arch/arm/mach-uniphier/cpu_info.c

arch/arm/mach-uniphier/dram/Makefile