ARM: Fix generic irq chip

As a result of c42321c (genirq: Make generic irq chip depend on
CONFIG_GENERIC_IRQ_CHIP), we now need those platforms using this in
my tree to select this symbol.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 44c16f0..9b63bab 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -854,6 +854,7 @@
 	select HAVE_IDE
 	select CLKDEV_LOOKUP
 	select GENERIC_ALLOCATOR
+	select GENERIC_IRQ_CHIP
 	select ARCH_HAS_HOLES_MEMORYMODEL
 	help
 	  Support for TI's DaVinci platform.
@@ -1033,6 +1034,7 @@
 
 config PLAT_ORION
 	bool
+	select GENERIC_IRQ_CHIP
 	select HAVE_SCHED_CLOCK
 
 config PLAT_PXA