sh: remove support for sh73180 and solution engine 73180

This patch removes old dead code:
- kill off sh73180 cpu support
- get rid of broken solution engine 73180 board support

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/include/asm-sh/bugs.h b/include/asm-sh/bugs.h
index aeee8da..d5d7a16 100644
--- a/include/asm-sh/bugs.h
+++ b/include/asm-sh/bugs.h
@@ -39,7 +39,7 @@
 		*p++ = '4';
 		*p++ = 'a';
 		break;
-	case CPU_SH73180 ... CPU_SH7722:
+	case CPU_SH7343 ... CPU_SH7722:
 		*p++ = '4';
 		*p++ = 'a';
 		*p++ = 'l';