MIPS: Have a heart for a lonely, lost header file ...

... and move it to where all its brothers and sisters reside.  Requested by
Shane McDonald <mcdonald.shane@gmail.com>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/include/asm-mips/cevt-r4k.h b/arch/mips/include/asm/cevt-r4k.h
similarity index 100%
rename from include/asm-mips/cevt-r4k.h
rename to arch/mips/include/asm/cevt-r4k.h