media: cx231xx: add decoder to AVerMedia H837

media: cx231xx: add decoder to AVerMedia H837

AVerMedia AVerTV Volar Hybrid Q (H837) TV tuner
did not have a decoder module attached.
Add a decoder module in order to create
media controller entity correctly.

Bug 2190055

Change-Id: Iffc48d64421b28df01a68874a6f32d360c1cd12c
Signed-off-by: Magdalena Grodzinska <mgrodzinska@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1807733
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>