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/omap3_zoom2.h b/include/configs/omap3_zoom2.h
index c57df8e..cb8c7ec 100644
--- a/include/configs/omap3_zoom2.h
+++ b/include/configs/omap3_zoom2.h
@@ -21,6 +21,7 @@
 #define CONFIG_OMAP34XX		1	/* which is a 34XX */
 #define CONFIG_OMAP3_ZOOM2	1	/* working with Zoom II */
 #define CONFIG_OMAP_GPIO
+#define CONFIG_OMAP_COMMON
 
 #define CONFIG_SDRC	/* The chip has SDRC controller */