[MIPS] Support for the R5500-based NEC EMMA2RH Mark-eins board

arch/mips/Kconfig

arch/mips/Makefile

arch/mips/configs/emma2rh_defconfig

arch/mips/emma2rh/common/Makefile

arch/mips/emma2rh/common/irq.c

arch/mips/emma2rh/common/irq_emma2rh.c

arch/mips/emma2rh/common/prom.c

arch/mips/emma2rh/markeins/Makefile

arch/mips/emma2rh/markeins/irq.c

arch/mips/emma2rh/markeins/irq_markeins.c

arch/mips/emma2rh/markeins/led.c

arch/mips/emma2rh/markeins/platform.c

arch/mips/emma2rh/markeins/setup.c

arch/mips/pci/Makefile

arch/mips/pci/fixup-emma2rh.c

arch/mips/pci/ops-emma2rh.c

arch/mips/pci/pci-emma2rh.c

include/asm-mips/bootinfo.h

include/asm-mips/emma2rh/emma2rh.h

include/asm-mips/emma2rh/markeins.h