sh: Remove duplicate SUPERH64 symbol.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index e406f1d..c0797b4 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -24,9 +24,6 @@
 	bool
 	default y
 
-config SUPERH64
-	def_bool y if CPU_SH5
-
 config RWSEM_XCHGADD_ALGORITHM
 	bool