Get rid of "#undef DEBUG" from board config files.

include/configs/AP1000.h

include/configs/BAB7xx.h

include/configs/EB+MCF-EV123.h

include/configs/ELPPC.h

include/configs/IPHASE4539.h

include/configs/M52277EVB.h

include/configs/M5235EVB.h

include/configs/M5271EVB.h

include/configs/M5329EVB.h

include/configs/M5373EVB.h

include/configs/M54455EVB.h

include/configs/M5475EVB.h

include/configs/M5485EVB.h

include/configs/MPC8315ERDB.h

include/configs/MPC8540EVAL.h

include/configs/MVBLUE.h

include/configs/QS823.h

include/configs/QS850.h

include/configs/QS860T.h

include/configs/Rattler.h