Fix the reason code used during Nss update request. If
there is MCC upgrade or DBS downgrade, the hw mode change
request internally send the Nss update request. But, the
current implementation uses the same fixed reason code
during Nss update request and due to this on receiving the
hw mode change response, the expected callback function is
not getting invoked. Fix this by passing the right reason
code during Nss update request.
CRs-Fixed: 978663
Change-Id: I706cb9a86d66d8601ec87f560459604e562f6037
ce2172e9ed