sh: Bump up NODES_SHIFT for SH-X3.

This was at 1, which is where most subtypes want it. SH-X3 has
more nodes, so bump it up to 3.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 569292c..e5801d9 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -308,6 +308,7 @@
 
 config NODES_SHIFT
 	int
+	default "3" if CPU_SUBTYPE_SHX3
 	default "1"
 	depends on NEED_MULTIPLE_NODES