sh: Add a SUPERH32 config symbol.

We need to differentiate from SUPERH64, so add a SUPERH32 for
regular sh.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig.sh

@@ -15,6 +15,9 @@ config SUPERH
 	  gaming console.  The SuperH port has a home page at
 	  <http://www.linux-sh.org/>.
 
+config SUPERH32
+	def_bool y
+
 config RWSEM_GENERIC_SPINLOCK
 	bool
 	default y