Add support to send whether currently TDLS is available or not.
Vendor subcmd: QCA_NL80211_VENDOR_SUBCMD_TDLS_GET_STATUS
Vendor attr: QCA_WLAN_VENDOR_ATTR_TDLS_GET_STATUS_AVAILABLE
Also add support to get the TDLS number of active sessions
using below vendor attr.
Vendor subcmd: QCA_NL80211_VENDOR_SUBCMD_TDLS_GET_STATUS
Vendor attr: QCA_WLAN_VENDOR_ATTR_TDLS_GET_STATUS_NUM_SESSIONS
Change-Id: Ie9ad09de9593559c4d57599a9af58a95af99e60f
CRs-Fixed: 3554429