rush: Add ec_dummy file to enable vboot compilation

BUG=chrome-os-partner:30784
BRANCH=None
TEST=Compiles successfully for rush

Original-Change-Id: Ic11bef85e5c7635000582f87727cd9a33b0b36e3
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/209975
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
(cherry picked from commit 3d3f0494d8758ef5040384f63d023c042686bd2c)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Ie15781d10a366b68f0db97378ccb348a4f074995
Reviewed-on: http://review.coreboot.org/8679
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/google/rush/Makefile.inc

@@ -36,6 +36,8 @@ romstage-y += reset.c
 romstage-y += romstage.c
 romstage-y += sdram_configs.c
 romstage-$(CONFIG_CHROMEOS) += chromeos.c
+romstage-y += ec_dummy.c
 
 ramstage-y += mainboard.c
 ramstage-$(CONFIG_CHROMEOS) += chromeos.c
+ramstage-y += ec_dummy.c

src/mainboard/google/rush/ec_dummy.c

@@ -0,0 +1,9 @@
+/* Dummy CHROMEEC file to provide stub functions for vboot compilation */
+
+#include <stdint.h>
+
+int google_chromeec_vbnv_context(int is_read, uint8_t *data, int len);
+int google_chromeec_vbnv_context(int is_read, uint8_t *data, int len)
+{
+	return 0;
+}