ARM: OMAP: Add CONFIG_OMAP_COMMON

Adding a new CONFIG_OMAP_COMMON which is included by all boards
that needs to build cpu/armv7/omap-common folder.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/include/configs/tricorder.h b/include/configs/tricorder.h
index 4e2cb65..a9b2714 100644
--- a/include/configs/tricorder.h
+++ b/include/configs/tricorder.h
@@ -19,6 +19,7 @@
 /* High Level Configuration Options */
 #define CONFIG_OMAP			/* in a TI OMAP core */
 #define CONFIG_OMAP34XX			/* which is a 34XX */
+#define CONFIG_OMAP_COMMON
 
 #define CONFIG_MACH_TYPE		MACH_TYPE_TRICORDER
 /*