sh64: Kill off virt_to_bus()/bus_to_virt().

Follows the SH change.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh64/Kconfig b/arch/sh64/Kconfig
index ff65420..5664631 100644
--- a/arch/sh64/Kconfig
+++ b/arch/sh64/Kconfig
@@ -47,6 +47,9 @@
 	bool
 	default n
 
+config ARCH_NO_VIRT_TO_BUS
+	def_bool y
+
 source init/Kconfig
 
 menu "System type"