[MIPS] The irq_chip for TX39/TX49 SoCs

Add generic irq_chip for TX39/TX49 SoCs.  This can be replace
jmr3927_irq_irc, tx4927_irq_pic_type and tx4938_irq_pic_type.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/Makefile

diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 07344cb..2fd96d95 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -50,6 +50,7 @@
 obj-$(CONFIG_IRQ_CPU_RM7K)	+= irq-rm7000.o
 obj-$(CONFIG_IRQ_CPU_RM9K)	+= irq-rm9000.o
 obj-$(CONFIG_MIPS_BOARDS_GEN)	+= irq-msc01.o
+obj-$(CONFIG_IRQ_TXX9)		+= irq_txx9.o
 
 obj-$(CONFIG_32BIT)		+= scall32-o32.o
 obj-$(CONFIG_64BIT)		+= scall64-64.o