qcacmn: Fix dp_types.h documentation

The kernel-doc script identified a large number of documentation
issues in dp/wifi3.0/dp_types.h, so fix those issues. In addition,
there are a number of instances where public functions have their
implementation documented instead of having their interface
documented, so duplicate that documentation. The documentation at the
implementation will be removed separately.

Change-Id: Ie93b7f802926e562169e51a56e5fc83de845b310
CRs-Fixed: 3373153