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/tam3517-common.h b/include/configs/tam3517-common.h
index c297827..c215f0b 100644
--- a/include/configs/tam3517-common.h
+++ b/include/configs/tam3517-common.h
@@ -16,6 +16,7 @@
 #define CONFIG_OMAP		/* in a TI OMAP core */
 #define CONFIG_OMAP34XX		/* which is a 34XX */
 #define CONFIG_OMAP_GPIO
+#define CONFIG_OMAP_COMMON
 
 #define CONFIG_SYS_TEXT_BASE 0x80008000