wlan: Avoid duplicate macaddress configuration

Propogation from qcacld-3.0 to prima

Currently if the MAC is changed dynamically for any interface,
driver is allowing to configure a MAC which is already in use by
some other interface and it will allow different interfaces to
come up on same MAC address.

To address this issue add a check to configfure only different
MAC address.

Change-Id: Iece3bb063be30d5d983f4bec710d6d16b22bd2f9
CRs-Fixed: 2629343