[Bug 730863] qtvideosink: add i.MX6 zero-copy rendering implementation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=730863

--- Comment #6 from Thomas McGuire <thomas.mcguire at kdab.com> ---
Note that in order to upstream the patch, it probably needs to gain a a few
"#ifdef HW_PLATFORM_IMX6" for the new code I added.

Some other improvements that could be made, based on
qsgvivantevideomaterial.cpp from QtMultimedia:
- Use glTexDirectVIV() + memcpy() if the physical address is not available
- Use only glTexDirectInvalidateVIV() if the same virtual address has already
been seen before

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