[ARM] mm: enable sparsemem on clps7500 and RiscPC

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4eb816c..83106c9 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -250,6 +250,7 @@
 	select TIMER_ACORN
 	select ISA
 	select NO_IOPORT
+	select ARCH_SPARSEMEM_ENABLE
 	help
 	  Support for the Cirrus Logic PS7500FE system-on-a-chip.
 
@@ -470,6 +471,7 @@
 	select HAVE_PATA_PLATFORM
 	select ISA_DMA_API
 	select NO_IOPORT
+	select ARCH_SPARSEMEM_ENABLE
 	help
 	  On the Acorn Risc-PC, Linux can support the internal IDE disk and
 	  CD-ROM interface, serial and parallel port, and the floppy drive.