rename CFG_ENV_IS_NOWHERE in CONFIG_ENV_IS_NOWHERE

board/xilinx/xilinx_enet/emac_adapter.c

common/cmd_nvedit.c

common/env_common.c

common/env_nowhere.c

drivers/net/xilinx_emaclite.c

include/configs/ADNPESC1.h

include/configs/DK1C20.h

include/configs/DK1S10.h

include/configs/JSE.h

include/configs/MPC8313ERDB.h

include/configs/MPC8315ERDB.h

include/configs/MPC8323ERDB.h

include/configs/MPC832XEMDS.h

include/configs/MPC8349EMDS.h

include/configs/MPC8349ITX.h

include/configs/MPC8360EMDS.h

include/configs/MPC8360ERDK.h

include/configs/MPC837XEMDS.h

include/configs/MPC837XERDB.h

include/configs/MPC8540ADS.h