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/processor.h b/include/asm-sh/processor.h
index 2252e75..7969d3a 100644
--- a/include/asm-sh/processor.h
+++ b/include/asm-sh/processor.h
@@ -55,7 +55,7 @@
 	CPU_SH7770, CPU_SH7780, CPU_SH7781, CPU_SH7785, CPU_SHX3,
 
 	/* SH4AL-DSP types */
-	CPU_SH73180, CPU_SH7343, CPU_SH7722,
+	CPU_SH7343, CPU_SH7722,
 
 	/* Unknown subtype */
 	CPU_SH_NONE