[MIPS] Add GT641xx IRQ routines.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ebc7b4b..90b409d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -64,6 +64,7 @@
 	select HW_HAS_PCI
 	select I8259
 	select IRQ_CPU
+	select IRQ_GT641XX
 	select PCI_GT64XXX_PCI0
 	select SYS_HAS_CPU_NEVADA
 	select SYS_HAS_EARLY_PRINTK
@@ -806,6 +807,9 @@
 config IRQ_TXX9
 	bool
 
+config IRQ_GT641XX
+	bool
+
 config MIPS_BOARDS_GEN
 	bool