OMAP3: Add support for OMAP3 die ID

Read and store OMAP3 die ID in U-Boot environment.

Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
diff --git a/board/omap3/evm/evm.c b/board/omap3/evm/evm.c
index b406312..3a27c8f 100644
--- a/board/omap3/evm/evm.c
+++ b/board/omap3/evm/evm.c
@@ -68,6 +68,8 @@
 	setup_net_chip();
 #endif
 
+	dieid_num_r();
+
 	return 0;
 }