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/cpu-sh4/freq.h b/include/asm-sh/cpu-sh4/freq.h
index 026025b..dc1d32a 100644
--- a/include/asm-sh/cpu-sh4/freq.h
+++ b/include/asm-sh/cpu-sh4/freq.h
@@ -10,7 +10,7 @@
 #ifndef __ASM_CPU_SH4_FREQ_H
 #define __ASM_CPU_SH4_FREQ_H
 
-#if defined(CONFIG_CPU_SUBTYPE_SH73180) || defined(CONFIG_CPU_SUBTYPE_SH7722)
+#if defined(CONFIG_CPU_SUBTYPE_SH7722)
 #define FRQCR		        0xa4150000
 #define VCLKCR			0xa4150004
 #define SCLKACR			0xa4150008