MIPS: EMMA: Fold arch/mips/emma/{common,markeins}/irq*.c into markeins/irq.c

Current EMMA2RH irq code is mess.  Before cleaning it up, gather them
in one place as a first step.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/emma/markeins/Makefile b/arch/mips/emma/markeins/Makefile
index 3c8b864..16e0017 100644
--- a/arch/mips/emma/markeins/Makefile
+++ b/arch/mips/emma/markeins/Makefile
@@ -10,4 +10,4 @@
 #  (at your option) any later version.
 #
 
-obj-$(CONFIG_NEC_MARKEINS) += irq.o irq_markeins.o setup.o led.o platform.o
+obj-$(CONFIG_NEC_MARKEINS) += irq.o setup.o led.o platform.o