sh: Make memory hot-add and hot-remove depend on MMU.

Cleans up link numerous build issues with page migration and so on when
enabled on nommu builds.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index f8e6dc5..555ec97 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -132,11 +132,11 @@
 
 config ARCH_ENABLE_MEMORY_HOTPLUG
 	def_bool y
-	depends on SPARSEMEM
+	depends on SPARSEMEM && MMU
 
 config ARCH_ENABLE_MEMORY_HOTREMOVE
 	def_bool y
-	depends on SPARSEMEM
+	depends on SPARSEMEM && MMU
 
 config ARCH_MEMORY_PROBE
 	def_bool y