qcacld-3.0: Unmap nbuf of pending mgmt frames

As part of wlan_mgmt_txrx_pdev_close only nbuf is freed
in case of cleanup path due to SSR or drive unload and
dma unmap is not done. In this change register a callback
to mgmt_txrx component tx ops which does dma unmap of nbuf
as part of pdev close.

Change-Id: Ia0fa6684f66a3b732e5c599f2df4ea7f33ebc4f8
CRs-Fixed: 2308372
3 files changed