mpc83xx: MPC8315ERDB: Use hwconfig for board type selection

This patch simply converts the board to the hwconfig infrastructure.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/include/configs/MPC8315ERDB.h b/include/configs/MPC8315ERDB.h
index 4cf48f7..7e6b9eb 100644
--- a/include/configs/MPC8315ERDB.h
+++ b/include/configs/MPC8315ERDB.h
@@ -72,6 +72,7 @@
 #define CONFIG_SYS_SICRL		0x00000000 /* 3.3V, no delay */
 
 #define CONFIG_BOARD_EARLY_INIT_F /* call board_pre_init */
+#define CONFIG_HWCONFIG
 
 /*
  * IMMR new address