x86: kconfig: Select ARCH_EARLY_INIT_R in the platform Kconfig

This is architecture-dependent early initialization hence should
be put in the platform Kconfig.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/qemu/Kconfig b/arch/x86/cpu/qemu/Kconfig
index 6808c9a..6f61744 100644
--- a/arch/x86/cpu/qemu/Kconfig
+++ b/arch/x86/cpu/qemu/Kconfig
@@ -6,6 +6,7 @@
 
 config QEMU
 	bool
+	select ARCH_EARLY_INIT_R
 
 if QEMU