CHROMIUM: Add #line to sched.c

Work around coreboot GCC preprocessor bug.

BUG=b:272518464
TEST=BOARD=skyrim ; zmake build --coverage $BOARD &&
./util/find_non_exec_lines.py build/zephyr/$BOARD/output/zephyr.inf

Change-Id: I977e50b33e33cc273244d1a53e6b5792b7eb2a18
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5731185
Tested-by: Jeremy Bettis <jbettis@chromium.org>
Commit-Queue: Jeremy Bettis <jbettis@chromium.org>
Reviewed-by: Abe Levkoy <alevkoy@chromium.org>

kernel/sched.c

@@ -3,6 +3,13 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
+
+/*
+ * TODO(b/272518464): Work around coreboot GCC preprocessor bug.
+ * #line marks the *next* line, so it is off by one.
+ */
+#line 12
+
 #include <zephyr/kernel.h>
 #include <ksched.h>
 #include <zephyr/spinlock.h>