media: venus: Create hfi platform and move vpp/vsp there

Introduce a new hfi platform to cover differences between hfi
versions. As a start move vpp/vsp freq data in that hfi
platform, more platform data will come later.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>