get correct tx power from ioctl

Propogate (CR) : get correct tx power from ioctl.
Restructured based on the 8250 files

Change-Id: I2216a0442cbb8dbb7fd9a1fcbbed5be9bec177ac
Reviewed-on: https://gerrit.mot.com/1456950
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Prashanth ChakRavarthy <a19110@motorola.com>
Submit-Approved: Raja Phani K <a16821@motorola.com>

core/hdd/src/wlan_hdd_hostapd_wext.c

@@ -1532,7 +1532,7 @@ static __iw_softap_set_max_tx_power(struct net_device *dev,
 {
 	struct hdd_adapter *adapter = (netdev_priv(dev));
 	struct hdd_context *hdd_ctx;
-	int *value = (int *)extra;
+	int *value = (int *)(wrqu->data.pointer);
 	int set_value;
 	int ret;
 	struct qdf_mac_addr bssid = QDF_MAC_ADDR_BCAST_INIT;