Gstreamer: also remove features when simplifying caps

Some element can return caps with same resolution/framerate but
different features. gst_simplify_caps() won't de-duplicate this,
resulting in duplicated entries for the same resolution/framerate.

This commit add calls to also remove features from the caps in addition
to setting name to video/x-raw.

The GST_CHECK_VERSION macro is added to maintain compatibility with
earlier version of Gstreamer without GstCapsFeatures.

[ChangeLog][CameraBin] Fixed duplicated entries in supported resolution/
framerate if the underlying element uses caps' features.

Change-Id: I15101899eb0369925013ccc1d925afb890a01205
Reviewed-by: VaL Doroshchuk <valentyn.doroshchuk@qt.io>