x86: Set APs' req_seq to the reg number from device tree

Multiple APs are brought up simultaneously and they may get the same
seq num in the uclass_resolve_seq() during device_probe(). To avoid
this, set req_seq to the reg number in the device tree in advance.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/mp_init.c

@@ -515,5 +515,12 @@ int mp_init(struct mp_params *p)
 
 int mp_init_cpu(struct udevice *cpu, void *unused)
 {
+	/*
+	 * Multiple APs are brought up simultaneously and they may get the same
+	 * seq num in the uclass_resolve_seq() during device_probe(). To avoid
+	 * this, set req_seq to the reg number in the device tree in advance.
+	 */
+	cpu->req_seq = fdtdec_get_int(gd->fdt_blob, cpu->of_offset, "reg", -1);
+
 	return device_probe(cpu);
 }