MIPS: math-emu: Rename get_rounding() functions.

There are two version of get_rounding(), one for single precision, one
for double precision.  Add a ieee754sp_ rsp. ieee754dp_ prefix for
clarity.

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/ieee754sp.c
Simple merge