usbtuner: add AVerMedia H837 support

usbtuner: add AVerMedia H837 support

Add support for TDA18272 tuner module and
AVerMedia AVerTV Volar Hybrid Q (H837) USB TV tuner.

Resolved style issues from original commit and
DVB frontend API issues for TDA18272.

Bug: 20649732
Bug 1736911
Bug 2190055

Change-Id: Ib550504231ba2eaedebb864295db50069ebe769c
Signed-off-by: Terry Heo <terryheo@google.com>
Reviewed-on: http://git-master/r/1311288
(cherry picked from commit 8240d550519c4b97e8c97efcf646439fce40a9a0)
Signed-off-by: Magdalena Grodzinska <mgrodzinska@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1806528
Reviewed-by: Aly Hirani <ahirani@nvidia.com>
Reviewed-by: Patrick Horng <phorng@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vinayak Pane <vpane@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>