ARM: mach-shmobile: Enable CONFIG_MULTI_IRQ_HANDLER

Always enable MULTI_IRQ_HANDLER on SH-Mobile.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/arm/Kconfig

@@ -638,6 +638,7 @@ config ARCH_SHMOBILE
 	select GENERIC_CLOCKEVENTS
 	select NO_IOPORT
 	select SPARSE_IRQ
+	select MULTI_IRQ_HANDLER
 	help
 	  Support for Renesas's SH-Mobile and R-Mobile ARM platforms.