ath10k: Add mesh point interface creation combination

Currently WCN3990 supports 3 concurrent VAP creation. This leads
to failure of mesh interface creation in concurrent cases.

Add creation of mesh point interface in interface combination
if CONFIG_MAC80211_MESH is enabled.

Change-Id: I06e1f4c488208e80ab7dd622e35228001d026395
Signed-off-by: Surabhi Vishnoi <svishnoi@codeaurora.org>
Signed-off-by: Balaji Pothunoori <bpothuno@codeaurora.org>