[qca-nss-clients] Update DTLS manager v1.0

 - Updated DTLS Mananger v1.0 driver to support the new DTLS API(s)
 - Added a new nss_dtlsmgr_get_interface() API so that users can
   uniformly query the NSS DTLS interface number across v1.0 and
   v2.0 drivers. Made changes in CAPWAP manager driver accordingly.

Change-Id: I5112fbcf11976c6534bb39313ab88b9296b560a4
Signed-off-by: Tanmay V Jagdale <tjagdale@codeaurora.org>
7 files changed