arm, da8xx: convert ipam390 board to generic board support

enable generic board support for the ipam390 board.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/include/configs/ipam390.h b/include/configs/ipam390.h
index 310d5e2..664a2b2 100644
--- a/include/configs/ipam390.h
+++ b/include/configs/ipam390.h
@@ -18,6 +18,7 @@
 /*
  * Board
  */
+#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_DRIVER_TI_EMAC
 #define CONFIG_BARIX_IPAM390