Blackfin: unify duplicate CPU port definitions

include/asm-blackfin/mach-bf527/ports.h

include/asm-blackfin/mach-bf533/ports.h

include/asm-blackfin/mach-bf537/ports.h

include/asm-blackfin/mach-bf548/ports.h

include/asm-blackfin/mach-bf561/def_local.h

include/asm-blackfin/mach-bf561/ports.h

include/asm-blackfin/mach-common/bits/ports-a.h

include/asm-blackfin/mach-common/bits/ports-b.h

include/asm-blackfin/mach-common/bits/ports-c.h

include/asm-blackfin/mach-common/bits/ports-d.h

include/asm-blackfin/mach-common/bits/ports-e.h

include/asm-blackfin/mach-common/bits/ports-f.h

include/asm-blackfin/mach-common/bits/ports-g.h

include/asm-blackfin/mach-common/bits/ports-h.h

include/asm-blackfin/mach-common/bits/ports-i.h

include/asm-blackfin/mach-common/bits/ports-j.h