PXA: pxa-regs.h cleanup

arch/arm/cpu/pxa/cpu.c

arch/arm/cpu/pxa/i2c.c

arch/arm/cpu/pxa/pxafb.c

arch/arm/cpu/pxa/timer.c

arch/arm/cpu/pxa/usb.c

arch/arm/include/asm/arch-pxa/hardware.h

arch/arm/include/asm/arch-pxa/pxa-regs.h

board/colibri_pxa270/colibri_pxa270.c

board/cradle/cradle.c

board/cradle/lowlevel_init.S

board/csb226/csb226.c

board/delta/delta.c

board/delta/nand.c

board/innokom/innokom.c

board/pxa255_idp/pxa_idp.c

board/trizepsiv/conxs.c

board/vpac270/vpac270.c

board/wepep250/wepep250.c

board/zipitz2/zipitz2.c

board/zylonite/nand.c