spl: Allow PCH drivers to be used in SPL

Add an option for building Platorm Controller Hub drivers in SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 3e71817..cf714c2 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -444,6 +444,15 @@
 	  necessary driver support. This enables the drivers in drivers/pci
 	  as part of an SPL build.
 
+config SPL_PCH_SUPPORT
+	bool "Support PCH drivers"
+	depends on SPL
+	help
+	  Enable support for PCH (Platform Controller Hub) devices in SPL.
+	  These are used to set up GPIOs and the SPI peripheral early in
+	  boot. This enables the drivers in drivers/pch as part of an SPL
+	  build.
+
 config SPL_POST_MEM_SUPPORT
 	bool "Support POST drivers"
 	depends on SPL