platform/chrome: wilco_ec: Annotate struct ec_event_queue with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct ec_event_queue.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Benson Leung <bleung@chromium.org>
Cc: Tzung-Bi Shih <tzungbi@kernel.org>
Cc: Dawei Li <set_pte_at@outlook.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Maximilian Luz <luzmaximilian@gmail.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiang Jian <jiangjian@cdjrlc.com>
Cc: chrome-platform@lists.linux.dev
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230922175146.work.219-kees@kernel.orgSigned-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

drivers/platform/chrome/wilco_ec/event.c

@@ -95,7 +95,7 @@ struct ec_event_queue {
 	int capacity;
 	int head;
 	int tail;
-	struct ec_event *entries[];
+	struct ec_event *entries[] __counted_by(capacity);
 };
 
 /* Maximum number of events to store in ec_event_queue */