qcacmn: Add vendor attribute to configure custom STA keep-alive interval

Introduce an attribute QCA_WLAN_VENDOR_ATTR_CONFIG_KEEP_ALIVE_INTERVAL
in QCA_NL80211_VENDOR_SUBCMD_SET_WIFI_CONFIGURATION to configure
station's keep-alive interval to the driver/firmware. This can be used
to resolve kickout issues from APs which kick out STAs before the BSS
maximum idle period expires.

Change-Id: I80c743d5a10b559a2ec027a1098ff55fc450007b
CRs-Fixed: 3795409

os_if/linux/qca_vendor.h

@@ -5911,6 +5911,18 @@ enum qca_wlan_vendor_attr_config {
 	 */
 	QCA_WLAN_VENDOR_ATTR_CONFIG_BTM_SUPPORT = 107,
 
+	/* 16-bit unsigned value to configure client's keep-alive interval in
+	 * seconds. The driver will reduce the keep-alive interval to this
+	 * configured value if the AP advertises BSS maximum idle period and if
+	 * that BSS max idle period is larger than this configured value. If the
+	 * AP does not advertise a maximum value, the configured value will be
+	 * used as a keep-alive period for unprotected frames.
+	 *
+	 * This configuration is applicable only during the STA's current
+	 * association.
+	 */
+	QCA_WLAN_VENDOR_ATTR_CONFIG_KEEP_ALIVE_INTERVAL = 108,
+
 	/* keep last */
 	QCA_WLAN_VENDOR_ATTR_CONFIG_AFTER_LAST,
 	QCA_WLAN_VENDOR_ATTR_CONFIG_MAX =