sh: Remove config.mk for sh7763rdp board

Move CONFIG_SYS_TEXT_BASE to the board's config file, and remove the
unnecessary config.mk file.

Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/include/configs/sh7763rdp.h b/include/configs/sh7763rdp.h
index 209cb88..6a08413 100644
--- a/include/configs/sh7763rdp.h
+++ b/include/configs/sh7763rdp.h
@@ -56,6 +56,7 @@
 #define CONFIG_BAUDRATE         115200
 #define CONFIG_CONS_SCIF2		1
 
+#define CONFIG_SYS_TEXT_BASE	0x8FFC0000
 #define CONFIG_SYS_LONGHELP		/* undef to save memory */
 #define CONFIG_SYS_PROMPT		"=> "	/* Monitor Command Prompt */
 #define CONFIG_SYS_CBSIZE		256	/* Buffer size for input from the Console */