test: media_device: Create a common MediaDeviceTest base class

Before adding more tests which will act on the vimc pipeline break out a
common base from media_device_link_test.cpp which already acts on vimc.
The new common base class will help reduce code duplication.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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