qcacld-3.0: Use MAX_PEERS instead of IBSS define in conn_info

Currently, SIR_MAX_NUM_STA_IN_IBSS(16) is used while updating
sta_ctx->conn_info in hdd_save_peer/hdd_delete_peer. IBSS
supports maximum 16 peers but NDP might support more based
on platform. This restricts the max supported NDP peers to 16.
But host driver supports MAX_PEERS(32) no.of peers and use the
same here as sta_ctx->conn_info has support for MAX_PEERS(32)
mac addresses.

Change-Id: Ic52422435f97929e22cf3c0897ce9173793ee12e
CRs-Fixed: 2673110