sh: First support code of SuperH.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index a6499e8..8af0589 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -267,6 +267,8 @@
 	if (hdr->ih_arch != IH_CPU_NIOS2)
 #elif defined(__PPC__)
 	if (hdr->ih_arch != IH_CPU_PPC)
+#elif defined(__sh__)
+	if (hdr->ih_arch != IH_CPU_SH)
 #else
 # error Unknown CPU type
 #endif