tricorder: switch to CONFIG_SYS_THUMB_BUILD

The tricorder and tricorder_flash boards have grown too big.
Reduce their size by building them with CONFIG_SYS_THUMB_BUILD.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>

include/configs/tricorder.h

@@ -17,6 +17,7 @@
 #define __CONFIG_H
 
 /* High Level Configuration Options */
+#define CONFIG_SYS_THUMB_BUILD
 #define CONFIG_OMAP			/* in a TI OMAP core */
 #define CONFIG_OMAP_COMMON
 /* Common ARM Erratas */