rename CFG_ENV macros to CONFIG_ENV

README

api/api.c

board/LEOX/elpt860/flash.c

board/MAI/AmigaOneG3SE/flash_new.c

board/RRvision/flash.c

board/a3000/flash.c

board/alaska/flash.c

board/amcc/bamboo/flash.c

board/amcc/bubinga/flash.c

board/amcc/ebony/flash.c

board/amcc/luan/flash.c

board/amcc/ocotea/flash.c

board/amcc/sequoia/sequoia.c

board/amcc/taihu/flash.c

board/amcc/walnut/flash.c

board/amcc/yucca/flash.c

board/armadillo/flash.c

board/atc/flash.c

board/atmel/at91rm9200dk/flash.c

board/barco/flash.c