Fix build errors and warnings / code cleanup.

MAKEALL

Makefile

board/esd/cpci750/sdram_init.c

board/freescale/common/pixis.c

board/mpc8641hpcn/mpc8641hpcn.c

board/mpc8641hpcn/sys_eeprom.c

board/spc1920/hpi.c

cpu/mpc86xx/interrupts.c

include/configs/GEN860T.h

include/configs/LANTEC.h

include/configs/MPC8260ADS.h

include/configs/MPC8266ADS.h

include/configs/MPC8313ERDB.h

include/configs/RBC823.h

include/configs/ep8260.h

include/configs/gw8260.h

include/configs/hymod.h

include/configs/mpc7448hpc2.h

include/configs/ppmc7xx.h

include/configs/sbc8349.h