Log changes in dtim_period

Trying to diagnose b/15167455, to determine whether
dtim_period is involved.

Change-Id: I5dbcf92c7e0bed7db47771c8b071a1155cd108ca
diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 970f069..96209ef 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -3418,6 +3418,8 @@
 	cmd->disable_hw_ack  = __cpu_to_le32(arg->disable_hw_ack);
 	cmd->beacon_interval = __cpu_to_le32(arg->bcn_intval);
 	cmd->dtim_period     = __cpu_to_le32(arg->dtim_period);
+	printk(KERN_WARNING "ath10k_wmi_vdev_start_restart: dtim_period=%d\n",
+	       arg->dtim_period);
 	cmd->flags           = __cpu_to_le32(flags);
 	cmd->bcn_tx_rate     = __cpu_to_le32(arg->bcn_tx_rate);
 	cmd->bcn_tx_power    = __cpu_to_le32(arg->bcn_tx_power);