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:
1) Register a callback to mgmt_txrx component tx ops which
does dma unmap of nbuf as part of pdev close.
2) Revert change id I6a7f5efa665a1da009e594248e88002df35ae9ff
as there are potential race conditions using the APIs added
as part of the change.
Change-Id: Id65388a5f4fcb989659bb2088a5e67a4e4e3d265
CRs-Fixed: 2313073
516330bf2e