platform/chrome: cros_ec: Avoid -Wflex-array-member-not-at-end warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Use the new TRAILING_OVERLAP() helper to fix the following warning:

drivers/platform/chrome/cros_ec.c:106:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

This helper creates a union between a flexible-array member (FAM)
and a set of members that would otherwise follow it. This overlays
the trailing members onto the FAM while preserving the original
memory layout.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/aJnvuv334M7TljoB@kspp
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Author: GustavoARSilva

drivers/platform/chrome/cros_ec.c

@@ -102,14 +102,13 @@ EXPORT_SYMBOL(cros_ec_irq_thread);
 static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
 {
 	int ret;
-	struct {
-		struct cros_ec_command msg;
+	TRAILING_OVERLAP(struct cros_ec_command, msg, data,
 		union {
 			struct ec_params_host_sleep_event req0;
 			struct ec_params_host_sleep_event_v1 req1;
 			struct ec_response_host_sleep_event_v1 resp1;
 		} u;
-	} __packed buf;
+	) __packed buf;
 
 	memset(&buf, 0, sizeof(buf));