sh: Disable big endian for SH-5.

All SH-5 machines are little endian.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig.cpu

@@ -12,6 +12,7 @@ config CPU_LITTLE_ENDIAN
 
 config CPU_BIG_ENDIAN
 	bool "Big Endian"
+	depends on !CPU_SH5
 
 endchoice