soc: Add Kconfig for each soc vendor

Allows explicit ordering for vendors that share a common configuration
that must be sourced last.

The issue is that chips in soc/{amd,intel}/[ab].* will be able to
override defaults set in this file, but Kconfig files that get sourced
later (soc/amd/[d-z].*) will NOT be able to override these defaults.

Note: intel and amd soc chips now need to be added manually to the new
Kconfig file

BUG=b:62235314
TEST=make lint-stable

Change-Id: Ida82ef184712e092aec1381a47aa1b54b74ed6b6
Signed-off-by: Chris Ching <chingcodes@google.com>
Reviewed-on: https://review.coreboot.org/22123
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/intel/Kconfig b/src/soc/intel/Kconfig
new file mode 100644
index 0000000..72ad3e0
--- /dev/null
+++ b/src/soc/intel/Kconfig
@@ -0,0 +1,15 @@
+# Load all chipsets
+source "src/soc/intel/apollolake/Kconfig"
+source "src/soc/intel/baytrail/Kconfig"
+source "src/soc/intel/braswell/Kconfig"
+source "src/soc/intel/broadwell/Kconfig"
+source "src/soc/intel/cannonlake/Kconfig"
+source "src/soc/intel/denverton_ns/Kconfig"
+source "src/soc/intel/fsp_baytrail/Kconfig"
+source "src/soc/intel/fsp_broadwell_de/Kconfig"
+source "src/soc/intel/quark/Kconfig"
+source "src/soc/intel/sch/Kconfig"
+source "src/soc/intel/skylake/Kconfig"
+
+# Load common config
+source "src/soc/intel/common/Kconfig"