MIPS: Remove unused {en,dis}able_fpu macros

These macros are not used anywhere in the kernel. Remove them.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6111/


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