sb/intel/i82801gx: Add the option to lock the platform

This allows to lock down spi among other things
Mostly copied from bd82x6x.

Tested on Intel DG41WV with the MRC_CACHE driver write protecting the
mrc_cache region.

Change-Id: If9c3a6118f4586d51c093edec896c347ba904b8f
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/23358
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/southbridge/intel/i82801gx/Kconfig b/src/southbridge/intel/i82801gx/Kconfig
index 9fd19ed..2670d23 100644
--- a/src/southbridge/intel/i82801gx/Kconfig
+++ b/src/southbridge/intel/i82801gx/Kconfig
@@ -26,6 +26,7 @@
 	select SOUTHBRIDGE_INTEL_COMMON_GPIO
 	select SOUTHBRIDGE_INTEL_COMMON_SMBUS
 	select SOUTHBRIDGE_INTEL_COMMON_SPI
+	select HAVE_INTEL_CHIPSET_LOCKDOWN
 
 if SOUTHBRIDGE_INTEL_I82801GX