MIPS: Fix build error for loongson64 and sgi-ip27

Select HAVE_ARCH_NODEDATA_EXTENSION for loongson64 to fix build error
when CONFIG_NUMA=y:

mips64el-unknown-linux-gnu-ld: mm/page_alloc.o: in function `free_area_init':
(.init.text+0x1714): undefined reference to `node_data'
mips64el-unknown-linux-gnu-ld: (.init.text+0x1730): undefined reference to `node_data'

Also, select HAVE_ARCH_NODEDATA_EXTENSION for sgi-ip27 to fix build error:

mips64el-unknown-linux-gnu-ld: mm/page_alloc.o: in function `free_area_init':
page_alloc.c:(.init.text+0x1ba8): undefined reference to `node_data'
mips64el-unknown-linux-gnu-ld: page_alloc.c:(.init.text+0x1bcc): undefined reference to `node_data'
mips64el-unknown-linux-gnu-ld: page_alloc.c:(.init.text+0x1be4): undefined reference to `node_data'
mips64el-unknown-linux-gnu-ld: page_alloc.c:(.init.text+0x1bf4): undefined reference to `node_data'

Signed-off-by: Feiyang Chen <[e-mail]>
Reviewed-by: Huacai Chen <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/Kconfig

···
 	select USE_OF
 	select BUILTIN_DTB
 	select PCI_HOST_GENERIC
+	select HAVE_ARCH_NODEDATA_EXTENSION if NUMA
 	help
 	  This enables the support of Loongson-2/3 family of machines.
 
···
 	select WAR_R10000_LLSC
 	select MIPS_L1_CACHE_SHIFT_7
 	select NUMA
+	select HAVE_ARCH_NODEDATA_EXTENSION
 	help
 	  This are the SGI Origin 200, Origin 2000 and Onyx 2 Graphics
 	  workstations.  To compile a Linux kernel that runs on these, say Y
···
 	  disabled.
 
 config SYS_SUPPORTS_NUMA
+	bool
+
+config HAVE_ARCH_NODEDATA_EXTENSION
 	bool
 
 config RELOCATABLE

arch/mips/loongson64/numa.c

···
 	prom_meminit();
 }
 EXPORT_SYMBOL(prom_init_numa_memory);
+
+pg_data_t * __init arch_alloc_nodedata(int nid)
+{
+	return memblock_alloc(sizeof(pg_data_t), SMP_CACHE_BYTES);
+}
+
+void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
+{
+	__node_data[nid] = pgdat;
+}

arch/mips/sgi-ip27/ip27-memory.c

···
 	memblock_free_all();
 	setup_zero_pages();	/* This comes from node 0 */
 }
+
+pg_data_t * __init arch_alloc_nodedata(int nid)
+{
+	return memblock_alloc(sizeof(pg_data_t), SMP_CACHE_BYTES);
+}
+
+void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
+{
+	__node_data[nid] = (struct node_data *)pgdat;
+}