ARM: pxa: enable MULTI_IRQ_HANDLER for all boards

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 47c22a7..3eacf57 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -619,6 +619,7 @@
 	select PLAT_PXA
 	select SPARSE_IRQ
 	select AUTO_ZRELADDR
+	select MULTI_IRQ_HANDLER
 	help
 	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.