sh: Convert sh64 to use the generic checksum code.

This plugs in GENERIC_CSUM support on sh64, and kills off all of the old
references.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 586cd04..739a12d 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -50,6 +50,10 @@
 	def_bool y
 	depends on BUG && SUPERH32
 
+config GENERIC_CSUM
+	def_bool y
+	depends on SUPERH64
+
 config GENERIC_FIND_NEXT_BIT
 	def_bool y