sh: remove sh5 support

sh5 never became a product and has probably never really worked.

Remove it by recursively deleting all associated Kconfig options
and all corresponding files.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rich Felker <dalias@libc.org>

tools/arch/sh/include/asm/barrier.h

@@ -22,7 +22,7 @@
  * Historically we have only done this type of barrier for the MMUCR, but
  * it's also necessary for the CCR, so we make it generic here instead.
  */
-#if defined(__SH4A__) || defined(__SH5__)
+#if defined(__SH4A__)
 #define mb()		__asm__ __volatile__ ("synco": : :"memory")
 #define rmb()		mb()
 #define wmb()		mb()