Disable vulkan and v4l2m2m for ffmpeg builds

Vulkan:
FFmpeg has a very draft support of vulkan in n5.x and n6.0,
it's promised to be introduced with some working functionality in n6.1.
We'll wait for 6.1, then test it. For now, let's get rid of the extra
dependency.

v4l2m2m:
It's a prospective hw acceleration on linux, especially on embeddded
platforms, but currently, in my experiments, it's not working with
both QtMM and ffmpeg cmd line.
Let's get rid of the not working codec. Hopefully, it'll be fixed
in the future.

Pick-to: 6.6 6.5
Change-Id: I2468f84ae2ec54043d2db83f1a9c08be8e4f509d
Reviewed-by: Lars Knoll <lars@knoll.priv.no>

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