src/Kconfig: src/soc/*/Kconfig files are gone, remove the include

The previous two patches removed all of the soc/Kconfig files, so there
is nothing to include anymore.  Get rid of the 'source' command that
includes them.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I95067c4702ef25a8a6db4d480c089f06986ce9b8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65329
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/Kconfig b/src/Kconfig
index 52d6a75..bec22a4 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -559,7 +559,6 @@
 menu "Chipset"
 
 comment "SoC"
-source "src/soc/*/Kconfig"
 source "src/soc/*/*/Kconfig"
 source "src/soc/*/*/Kconfig.common"
 comment "CPU"