CHROMIUM: Fix #line directive in atomic.h

atomic.h was modified in commit 4e976e0 and the #line got off by one.
That is a known problem with adding these #line directives.

BUG=b:272518464
TEST=Ran coverage build

Change-Id: I353cf819042d418677e64f1a228cd5415e68ab1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5089616
Commit-Queue: Jeremy Bettis <jbettis@chromium.org>
Commit-Queue: Tristan Honscheid <honscheid@google.com>
Auto-Submit: Jeremy Bettis <jbettis@chromium.org>
Reviewed-by: Tristan Honscheid <honscheid@google.com>
Tested-by: Jeremy Bettis <jbettis@chromium.org>

include/zephyr/sys/atomic.h

@@ -10,7 +10,7 @@
  * TODO(b/272518464): Work around coreboot GCC preprocessor bug.
  * #line marks the *next* line, so it is off by one.
  */
-#line 13
+#line 14
 
 #ifndef ZEPHYR_INCLUDE_SYS_ATOMIC_H_
 #define ZEPHYR_INCLUDE_SYS_ATOMIC_H_