mb/google/octopus/var/bobba: Define GPIO_134 as EC_SYNC_IRQ

Use GPIO_134 as the EC sync interrupt and provide this value
to the embedded controller to be exported to the OS.

BRANCH=none
BUG=crbug:896347, b:118443377
CQ-DEPEND=CL:1298699
TEST=verify sensor events coming in on a reworked board
     with companion EC and kernel patches

Change-Id: I41333cabe97bc8b0d59e19d84366f2ea2a59e026
Signed-off-by: Enrico Granata <egranata@chromium.org>
Reviewed-on: https://review.coreboot.org/29278
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/octopus/variants/bobba/include/variant/ec.h

@@ -18,4 +18,7 @@
 
 #include <baseboard/ec.h>
 
+/* Enable EC sync interrupt, EC_SYNC_IRQ is defined in variant/gpio.h */
+#define EC_ENABLE_SYNC_IRQ
+
 #endif

src/mainboard/google/octopus/variants/bobba/include/variant/gpio.h

@@ -18,4 +18,7 @@
 
 #include <baseboard/gpio.h>
 
+/* EC sync irq is GPP_134_IRQ */
+#define EC_SYNC_IRQ	GPIO_134_IRQ
+
 #endif /* MAINBOARD_GPIO_H */