MIPS: Netlogic: replace early_init_devtree() call

The early_init_devtree() API was removed in linux-next for 3.13 with
commit "mips: use early_init_dt_scan". This causes Netlogic XLP compile
to fail:

arch/mips/netlogic/xlp/setup.c:101: undefined reference to `early_init_devtree'

Add xlp_early_init_devtree() which uses the __dt_setup_arch() to
handle early device tree related initialization to fix this.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
diff --git a/arch/mips/netlogic/xlp/setup.c b/arch/mips/netlogic/xlp/setup.c
index 76a7131..6d981bb 100644
--- a/arch/mips/netlogic/xlp/setup.c
+++ b/arch/mips/netlogic/xlp/setup.c
@@ -98,7 +98,7 @@
 	pm_power_off	= nlm_linux_exit;
 
 	/* memory and bootargs from DT */
-	early_init_devtree(initial_boot_params);
+	xlp_early_init_devtree();
 
 	if (boot_mem_map.nr_map == 0) {
 		pr_info("Using DRAM BARs for memory map.\n");