x86: Move INTEL_ACPIGEN to arch/x86

This option is better placed in the x86 code since it is not generic
enough to be in the core code. Move it.

Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: fixed a typo in arch/x86/Kconfig]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index eddf2a7..94081a1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1001,6 +1001,15 @@
 config PCIEX_LENGTH_64MB
 	bool
 
+config INTEL_ACPIGEN
+	bool "Support ACPI table generation for Intel SoCs"
+	depends on ACPIGEN
+	help
+	  This option adds some functions used for programmatic generation of
+	  ACPI tables on Intel SoCs. This provides features for writing CPU
+	  information such as P states and T stages. Also included is a way
+	  to create a GNVS table and set it up.
+
 config INTEL_GMA_ACPI
 	bool "Generate ACPI table for Intel GMA graphics"
 	help