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/devkit8000.h b/include/configs/devkit8000.h
index 513121a..cb79b4e 100644
--- a/include/configs/devkit8000.h
+++ b/include/configs/devkit8000.h
@@ -21,6 +21,7 @@
 #define CONFIG_OMAP3_DEVKIT8000	1	/* working with DevKit8000 */
 #define CONFIG_MACH_TYPE	MACH_TYPE_DEVKIT8000
 #define CONFIG_OMAP_GPIO
+#define CONFIG_OMAP_COMMON
 
 /*
  * 1MB into the SDRAM to allow for SPL's bss at the beginning of SDRAM