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treewide: Import and enable v4l2loopback #15

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This PR imports and enables v4l2loopback for the Volla Phone X.

Using this, plus a "sauced" change waiting for upstream approval, it is possible
to achieve camera support in V4L2 applications like Morph with the right bridging
daemon, opticd in this case.

From: https://github.com/umlaeute/v4l2loopback
Revision: baf9de279afc7a7c7513e9c40a0c9ff88f456af4

Slightly modified to compile as an in-tree module.
Allow the kernel module to send hints to userspace, via reading
the v4l2loopback control device, regarding access of v4l2 device nodes.

This will allow frame producers to determine when to pause production
or to show permission dialogs on behalf of the camera bridge system.
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