copper: load device tree blob

Update LK to find the device tree from the device tree
table present in the boot.img.

Change-Id: I097908c20a6db954e92965df748b1061ccba17dd
diff --git a/platform/copper/platform.c b/platform/copper/platform.c
index b8c7279..397bb84 100644
--- a/platform/copper/platform.c
+++ b/platform/copper/platform.c
@@ -38,6 +38,7 @@
 
 void platform_early_init(void)
 {
+	board_init();
 	platform_clock_init();
 	qgic_init();
 	qtimer_init();