qcacmn: Add QCA vendor attribute to configure ARP/NS offload feature

Add a QCA vendor attribute QCA_WLAN_VENDOR_ATTR_CONFIG_ARP_NS_OFFLOAD to
configure ARP/NS offload feature.

Change-Id: I976ed866272c7c82ff12593339bd2d551af6741b
CRs-Fixed: 3062895

os_if/linux/qca_vendor.h

@@ -4907,6 +4907,20 @@ enum qca_wlan_vendor_attr_config {
 	 * this attribute are 1-Enable and 0-Disable.
 	 */
 	QCA_WLAN_VENDOR_ATTR_CONFIG_FT_OVER_DS = 80,
+
+	/*
+	 * 8-bit unsigned value. This attribute can be used to configure the
+	 * firmware to enable/disable ARP/NS offload feature. Possible values
+	 * for this attribute are 0-Disable and 1-Enable.
+	 *
+	 * This attribute is only applicable for STA/P2P-Client interface,
+	 * and is optional, default behavior is APR/NS offload Enable.
+	 *
+	 * This attribute can be set in disconncted and connected state, and
+	 * will restore to default behavior if interface is closed.
+	 */
+	QCA_WLAN_VENDOR_ATTR_CONFIG_ARP_NS_OFFLOAD = 81,
+
 	/* keep last */
 	QCA_WLAN_VENDOR_ATTR_CONFIG_AFTER_LAST,
 	QCA_WLAN_VENDOR_ATTR_CONFIG_MAX =