MIPS: Remove redundant definitions of device_tree_init()

There exists many same definitions of device_tree_init() for various
platforms, add a weak function in arch/mips/kernel/prom.c to clean
up the related code.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: seehearfeel

arch/mips/ath79/setup.c

@@ -269,8 +269,3 @@ void __init arch_init_irq(void)
 {
 	irqchip_init();
 }
-
-void __init device_tree_init(void)
-{
-	unflatten_and_copy_device_tree();
-}

arch/mips/kernel/prom.c

@@ -64,4 +64,9 @@ int __init __dt_register_buses(const char *bus0, const char *bus1)
 	return 0;
 }
 
+void __weak __init device_tree_init(void)
+{
+	unflatten_and_copy_device_tree();
+}
+
 #endif

arch/mips/lantiq/prom.c

@@ -84,11 +84,6 @@ void __init plat_mem_setup(void)
 	__dt_setup_arch(dtb);
 }
 
-void __init device_tree_init(void)
-{
-	unflatten_and_copy_device_tree();
-}
-
 void __init prom_init(void)
 {
 	/* call the soc specific detetcion code and get it to fill soc_info */

arch/mips/loongson64/setup.c

@@ -36,8 +36,3 @@ void __init plat_mem_setup(void)
 	if (loongson_fdt_blob)
 		__dt_setup_arch(loongson_fdt_blob);
 }
-
-void __init device_tree_init(void)
-{
-	unflatten_and_copy_device_tree();
-}

arch/mips/mti-malta/Makefile

@@ -6,7 +6,6 @@
 # Copyright (C) 2008 Wind River Systems, Inc.
 #   written by Ralf Baechle <ralf@linux-mips.org>
 #
-obj-y				+= malta-dt.o
 obj-y				+= malta-dtshim.o
 obj-y				+= malta-init.o
 obj-y				+= malta-int.o

arch/mips/mti-malta/malta-dt.c

@@ -78,11 +78,6 @@ void __init prom_init(void)
 	pic32_init_cmdline((int)fw_arg0, (char **)fw_arg1);
 }
 
-void __init device_tree_init(void)
-{
-	unflatten_and_copy_device_tree();
-}
-
 static struct pic32_sdhci_platform_data sdhci_data = {
 	.setup_dma = pic32_set_sdhci_adma_fifo_threshold,
 };

arch/mips/pic32/pic32mzda/init.c

@@ -48,11 +48,6 @@ __iomem void *plat_of_remap_node(const char *node)
 	return ioremap(res.start, resource_size(&res));
 }
 
-void __init device_tree_init(void)
-{
-	unflatten_and_copy_device_tree();
-}
-
 void __init plat_mem_setup(void)
 {
 	void *dtb;