x86: Allow CPUs to be set up after relocation

This permits init of additional CPU cores after relocation and when driver
model is ready.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/include/asm/u-boot-x86.h b/arch/x86/include/asm/u-boot-x86.h
index 122e054..be103c0 100644
--- a/arch/x86/include/asm/u-boot-x86.h
+++ b/arch/x86/include/asm/u-boot-x86.h
@@ -69,6 +69,8 @@
 
 void quick_ram_check(void);
 
+int x86_init_cpus(void);
+
 #define PCI_VGA_RAM_IMAGE_START		0xc0000
 
 #endif	/* _U_BOOT_I386_H_ */