arch/mips/: Spelling fixes

arch/mips/au1000/mtx-1/board_setup.c

arch/mips/kernel/binfmt_elfn32.c

arch/mips/kernel/binfmt_elfo32.c

arch/mips/kernel/kspd.c

arch/mips/kernel/setup.c

arch/mips/kernel/smtc.c

arch/mips/mm/c-r4k.c

arch/mips/sgi-ip27/ip27-hubio.c