qcacld-3.0: Migrate bus_bw to qdf_periodic_work

The bus bandwidth compute is a periodic activity that calculates the
required DDR bandwidth needed by the wlan driver. Currently it is
implemented using a spinlock, a flag, a timer, and a kernel work.
qdf_periodic_work effectively implements the same behavior, so use it
instead.

Change-Id: I1c71a1eb430317d2ac167b7c1ba94fb190deef4a
CRs-Fixed: 2410047
2 files changed