sh: sh2: remove CONFIG_SH2 definition from board config

CONFIG_SH2 was already defined in arch/sh/sh2/config.mk.
This removes CONFIG_SH2 from board config files of SH2.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/include/configs/rsk7203.h b/include/configs/rsk7203.h
index d64579f..5920a26 100644
--- a/include/configs/rsk7203.h
+++ b/include/configs/rsk7203.h
@@ -11,7 +11,6 @@
 #define __RSK7203_H
 
 #undef DEBUG
-#define CONFIG_SH2		1
 #define CONFIG_SH2A		1
 #define CONFIG_CPU_SH7203	1
 #define CONFIG_RSK7203	1
diff --git a/include/configs/rsk7264.h b/include/configs/rsk7264.h
index 62b0618..5338cf2 100644
--- a/include/configs/rsk7264.h
+++ b/include/configs/rsk7264.h
@@ -12,7 +12,6 @@
 #define __RSK7264_H
 
 #undef DEBUG
-#define CONFIG_SH2		1
 #define CONFIG_SH2A		1
 #define CONFIG_CPU_SH7264	1
 #define CONFIG_RSK7264		1
diff --git a/include/configs/rsk7269.h b/include/configs/rsk7269.h
index 452f5b4..4796039 100644
--- a/include/configs/rsk7269.h
+++ b/include/configs/rsk7269.h
@@ -11,7 +11,6 @@
 #define __RSK7269_H
 
 #undef DEBUG
-#define CONFIG_SH2		1
 #define CONFIG_SH2A		1
 #define CONFIG_CPU_SH7269	1
 #define CONFIG_RSK7269		1