ppx4xx: Fix broken DASA_SIM board

This patch adds initdram() to DASA_SIM boards that has been
removed accidentally by a previous commit.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Signed-off-by: Stefan Roese <sr@denx.de>

board/esd/dasa_sim/dasa_sim.c

@@ -202,3 +202,8 @@ int checkboard (void)
 
 	return 0;
 }
+
+phys_size_t initdram (int board_type)
+{
+	return (16 * 1024 * 1024);
+}