MIPS: Fix cmdline "mem=" parameter parsing

This problem may only occur on NUMA platforms. When machine start with the
"mem=" parameter on Loongson64, it cannot boot. When parsing the "mem="
parameter, first remove all RAM, and then add memory through memblock_add(),
which causes the newly added memory to be located on MAX_NUMNODES.

The solution is to add the current "mem=" parameter range to the memory area
of the corresponding node, instead of adding all of it to the MAX_NUMNODES
node area. Get the node number corresponding to the "mem=" parameter range
through pa_to_nid(), and then add it to the corresponding node through
memblock_add_node().

Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Youling Tang <tangyouling@loongson.cn>

arch/mips/kernel/setup.c

@@ -359,7 +359,7 @@ static int __init early_parse_mem(char *p)
 	if (*p == '@')
 		start = memparse(p + 1, &p);
 
-	memblock_add(start, size);
+	memblock_add_node(start, size, pa_to_nid(start));
 
 	return 0;
 }