ARM: UniPhier: add UniPhier SoC support code

arch/arm/cpu/armv7/uniphier/Makefile

arch/arm/cpu/armv7/uniphier/board_common.c

arch/arm/cpu/armv7/uniphier/board_late_init.c

arch/arm/cpu/armv7/uniphier/cache_uniphier.c

arch/arm/cpu/armv7/uniphier/cmd_pinmon.c

arch/arm/cpu/armv7/uniphier/cpu_info.c

arch/arm/cpu/armv7/uniphier/dram_init.c

arch/arm/cpu/armv7/uniphier/init_page_table.c

arch/arm/cpu/armv7/uniphier/lowlevel_init.S

arch/arm/cpu/armv7/uniphier/ph1-ld4/Makefile

arch/arm/cpu/armv7/uniphier/ph1-ld4/bcu_init.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/board_info.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/board_postclk_init.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/boot-mode.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/clkrst_init.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/pinctrl.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/pll_init.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/pll_spectrum.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/sbc_init.c

arch/arm/cpu/armv7/uniphier/ph1-ld4/sg_init.c