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_evm_common.h b/include/configs/omap3_evm_common.h
index 3b3e25a..edf6543 100644
--- a/include/configs/omap3_evm_common.h
+++ b/include/configs/omap3_evm_common.h
@@ -15,6 +15,7 @@
 #define CONFIG_OMAP			/* This is TI OMAP core */
 #define CONFIG_OMAP34XX			/* belonging to 34XX family */
 #define CONFIG_OMAP_GPIO
+#define CONFIG_OMAP_COMMON
 
 #define CONFIG_SDRC			/* The chip has SDRC controller */