zephyr: replace zephyr integer types with C99 types

	git grep -l 'u\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/u\(8\|16\|32\|64\)_t/uint\1_t/g"
	git grep -l 's\(8\|16\|32\|64\)_t' | \
		xargs sed -i "s/s\(8\|16\|32\|64\)_t/int\1_t/g"

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
diff --git a/kernel/mailbox.c b/kernel/mailbox.c
index cd9016f..bb20e8f 100644
--- a/kernel/mailbox.c
+++ b/kernel/mailbox.c
@@ -120,7 +120,7 @@
 static int mbox_message_match(struct k_mbox_msg *tx_msg,
 			       struct k_mbox_msg *rx_msg)
 {
-	u32_t temp_info;
+	uint32_t temp_info;
 
 	if (((tx_msg->tx_target_thread == (k_tid_t)K_ANY) ||
 	     (tx_msg->tx_target_thread == rx_msg->tx_target_thread)) &&