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_zoom1.h b/include/configs/omap3_zoom1.h
index 3687045..c747d52 100644
--- a/include/configs/omap3_zoom1.h
+++ b/include/configs/omap3_zoom1.h
@@ -19,6 +19,7 @@
 #define CONFIG_OMAP		1	/* in a TI OMAP core */
 #define CONFIG_OMAP34XX		1	/* which is a 34XX */
 #define CONFIG_OMAP3_ZOOM1	1	/* working with Zoom MDK Rev1 */
+#define CONFIG_OMAP_COMMON
 
 #define CONFIG_SDRC	/* The chip has SDRC controller */