core: allow radio users to access all rmnet* interface

Change-Id: Ibc3bf9654cf68362369422f82afe53ef86e3e710
Add HTC Logging functions to support newer HTC props.

ifdef'd with HTCLOG.

Patchset2: remove unused function.

Patchset3: add indents to returns.

Change-Id: I70d0a6878dddf0f41d96735febda82c93496d8ec