sh: Remove config.mk for ms7722se 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/ms7722se.h b/include/configs/ms7722se.h
index 1ddadf6..c8d04f7 100644
--- a/include/configs/ms7722se.h
+++ b/include/configs/ms7722se.h
@@ -57,6 +57,7 @@
 #define MS7722SE_FLASH_BASE_1	(0xA0000000)
 #define MS7722SE_FLASH_BANK_SIZE	(8*1024 * 1024)
 
+#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 */