cpu: Add DM_FLAG_PRE_RELOC flag to various cpu drivers

It turns out commit c0434407b595 broke some boards which have DM CPU
driver with CONFIG_DISPLAY_CPUINFO option on. These boards just fail
to boot when print_cpuinfo() is called during boot.

Fixes: c0434407b595 ("board_f: Use static print_cpuinfo if CONFIG_CPU is active")
Reported-by: Stefan Roese <sr@denx.de>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>

arch/x86/cpu/baytrail/cpu.c

@@ -203,4 +203,5 @@ U_BOOT_DRIVER(cpu_x86_baytrail_drv) = {
 	.bind		= cpu_x86_bind,
 	.probe		= cpu_x86_baytrail_probe,
 	.ops		= &cpu_x86_baytrail_ops,
+	.flags		= DM_FLAG_PRE_RELOC,
 };

arch/x86/cpu/broadwell/cpu.c

@@ -764,4 +764,5 @@ U_BOOT_DRIVER(cpu_x86_broadwell_drv) = {
 	.probe		= cpu_x86_broadwell_probe,
 	.ops		= &cpu_x86_broadwell_ops,
 	.priv_auto_alloc_size	= sizeof(struct cpu_broadwell_priv),
+	.flags		= DM_FLAG_PRE_RELOC,
 };

arch/x86/cpu/cpu_x86.c

@@ -94,4 +94,5 @@ U_BOOT_DRIVER(cpu_x86_drv) = {
 	.of_match	= cpu_x86_ids,
 	.bind		= cpu_x86_bind,
 	.ops		= &cpu_x86_ops,
+	.flags		= DM_FLAG_PRE_RELOC,
 };

arch/x86/cpu/ivybridge/model_206ax.c

@@ -478,4 +478,5 @@ U_BOOT_DRIVER(cpu_x86_model_206ax_drv) = {
 	.bind		= cpu_x86_bind,
 	.probe		= cpu_x86_model_206ax_probe,
 	.ops		= &cpu_x86_model_206ax_ops,
+	.flags		= DM_FLAG_PRE_RELOC,
 };