CHROMIUM: Add #line to i2c.h

Work around coreboot GCC preprocessor bug.

BUG=b:272518464
TEST=BOARD=lotso ; zmake build -c $BOARD &&
./util/find_non_exec_lines.py build/zephyr/$BOARD/output/zephyr.info

Change-Id: I5b108fcd922b4e81326c741728b62144425754ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5796764
Reviewed-by: Abe Levkoy <alevkoy@chromium.org>
Commit-Queue: Jeremy Bettis <jbettis@chromium.org>
Commit-Queue: ChromeOS Auto Runner <chromeos-auto-runner@chromeos-bot.iam.gserviceaccount.com>
Tested-by: Jeremy Bettis <jbettis@chromium.org>

include/zephyr/drivers/i2c.h

@@ -35,6 +35,8 @@
 #include <zephyr/sys/slist.h>
 #include <zephyr/rtio/rtio.h>
 
+#line 39
+
 #ifdef __cplusplus
 extern "C" {
 #endif