Add support for Google ChromeEC

Google ChromeEC is an EC with completely open source firmware.
See https://gerrit.chromium.org/gerrit/gitweb?p=chromiumos/platform/ec.git;a=summary
for the EC firmware source code (aka more information about the ChromeEC)

This patch adds support for the ChromeEC on coreboot's side.

Great thanks to the ChromeEC team for this amazing work. It's another
important milestone towards a free and open firmware stack on modern
hardware.

Change-Id: Iace78af9d291791d2f5f80ccca1587b418738cec
Signed-off-by: Stefan Reinauer <reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/2481
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/ec/google/chromeec/Kconfig b/src/ec/google/chromeec/Kconfig
new file mode 100644
index 0000000..b8d3444
--- /dev/null
+++ b/src/ec/google/chromeec/Kconfig
@@ -0,0 +1,11 @@
+config EC_GOOGLE_CHROMEEC
+	bool
+	help
+	  Google's Chrome EC
+
+config EC_GOOGLE_API_ROOT
+       depends on EC_GOOGLE_CHROMEEC
+       string "Path to the EC API include file"
+       default "/usr/include"
+       help
+         Path to the ec API file (ec/ec_commands.h).