Remove GStreamer 0.10 support

Remove GStreamer 0.10 support

The GStreamer 0.10 support is dead upstream and is being moved away of
OE-Core so there is no much sense to keep supporting and testing it.

This removes support for i.MX23, i.MX28 and i.MX5 SoCs for video
decoding using through Freescale proprietary plugin and codecs.

The support for i.MX5 SoCs can now be used in with Linux kernel
mainline, with GStreamer 1.0, without the need of Freescale
proprietary codecs.

The patch removes all the metadata specific to the GStreamer 0.10
support so it allow for an easier identification of the changes and
code.

Change-Id: I02ae3a104d303037031f02f66866255540c6e678
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>