chromebooks: Define GBB hardware IDs

This makes the test IDs the default, taken from depthcharge
master (board/*/fmap.dts, hwid property).

Change-Id: I25793962ac16f451f204dbba6ede6a64c847cfd5
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13634
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins)
diff --git a/src/mainboard/google/purin/Kconfig b/src/mainboard/google/purin/Kconfig
index c3dca82..aca20e3 100644
--- a/src/mainboard/google/purin/Kconfig
+++ b/src/mainboard/google/purin/Kconfig
@@ -51,4 +51,8 @@
 	int
 	default 256
 
+config GBB_HWID
+	string
+	depends on CHROMEOS
+	default "Purin TEST 1"
 endif #  BOARD_GOOGLE_PURIN