While the concepts of osif_sync started out as a simple set of APIs, it
ultimately evolved into its own full-fledge code module. While the
per-function documenation is present, high-level documentation for the
osif_sync code module as a whole was over looked. Add a high-level
description of the purpose of osif_sync in osif_sync.h
Change-Id: I42cd28673b500c85ecf95de4b507b677804892ba
CRs-Fixed: 2421801
Change I556e9d2833edd2bd26266496b6000347649c5fbe moved hdd_dsc to osif,
but retained the existing naming. Rename hdd_vdev_sync to a more
appropriate osif_vdev_sync, and address any remaining naming problems.
Change-Id: Ic0983a79b09254b1615a348fe540f1dc0121baff
CRs-Fixed: 2396514
Move the contents of hdd_dsc to the new files added in osif/sync as part
of Ica94d32028d10d344294d6cc12d91a06efe1ab6c.
Change-Id: I556e9d2833edd2bd26266496b6000347649c5fbe
CRs-Fixed: 2396512
To better align with current organizational recommendations and allow
API use by os_if/nan, begin moving hdd_*_sync APIs to os_if. In step
one, create the new osif_sync file structure.
Change-Id: Ica94d32028d10d344294d6cc12d91a06efe1ab6c
CRs-Fixed: 2396511
