MIPS: math-emu: Remove unused ieee754sp_bestnan() and ieee754dp_bestnan().

Both are unused since lmo commit fdffbafbb38723618626c70ffdc6ff9175cdffa2
[Lots of FPU bug fixes from Kjeld Borch Egevang.]

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

diff --cc arch/mips/math-emu/ieee754dp.c
Simple merge

diff --cc arch/mips/math-emu/ieee754dp.h
Simple merge

diff --cc arch/mips/math-emu/ieee754sp.c
Simple merge

diff --cc arch/mips/math-emu/ieee754sp.h
Simple merge