Support the MIPS32 / MIPS64 DSP ASE.

arch/mips/kernel/asm-offsets.c

arch/mips/kernel/branch.c

arch/mips/kernel/cpu-probe.c

arch/mips/kernel/genex.S

arch/mips/kernel/process.c

arch/mips/kernel/ptrace.c

arch/mips/kernel/ptrace32.c

arch/mips/kernel/r4k_fpu.S

arch/mips/kernel/scall32-o32.S

arch/mips/kernel/setup.c

arch/mips/kernel/signal-common.h

arch/mips/kernel/signal.c

arch/mips/kernel/signal32.c

arch/mips/kernel/traps.c

include/asm-mips/abi.h

include/asm-mips/cpu-features.h

include/asm-mips/cpu.h

include/asm-mips/dsp.h

include/asm-mips/elf.h

include/asm-mips/inst.h