MIPS: Declare emulate_load_store_microMIPS as a static function.

It is only used from within a single file, it should not be globally
visible.

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5325/


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