move ARM Ltd. to vendor dir

Makefile

board/armltd/.gitignore

board/armltd/integratorap/Makefile

board/armltd/integratorap/config.mk

board/armltd/integratorap/flash.c

board/armltd/integratorap/integratorap.c

board/armltd/integratorap/lowlevel_init.S

board/armltd/integratorap/split_by_variant.sh

board/armltd/integratorap/u-boot.lds.template

board/armltd/integratorcp/Makefile

board/armltd/integratorcp/config.mk

board/armltd/integratorcp/flash.c

board/armltd/integratorcp/integratorcp.c

board/armltd/integratorcp/lowlevel_init.S

board/armltd/integratorcp/split_by_variant.sh

board/armltd/integratorcp/u-boot.lds.template

board/armltd/versatile/Makefile

board/armltd/versatile/config.mk

board/armltd/versatile/flash.c

board/armltd/versatile/lowlevel_init.S