ARM: 7343/1: sa11x0: convert to sparse IRQ

Now that Neponset, UCB1x00 and SA1111 are all converted to use the IRQ
allocation interfaces, we can enable sparse IRQ support for SA11x0
platforms.
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a48aecc..34aed71 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -760,6 +760,7 @@
 	select ARCH_REQUIRE_GPIOLIB
 	select HAVE_IDE
 	select NEED_MACH_MEMORY_H
+	select SPARSE_IRQ
 	help
 	  Support for StrongARM 11x0 based boards.