MIPS: oprofile: Fix breakage when CONFIG_OPROFILE=m

When the oprofile is compiled as a module do_IRQ() is not called in
arch/mips/loongson/lemote-2f/irq.c due to a wrong #ifdef there.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/1143/


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