samples: usb: uvc: fix target sample filters for board specific overlays

[dleach02]

Recent addition of UVC Video encoder added sample targets to the sample without the proper filter to ensure twister didn't try to automatically build the sample target on unsupported boards.

Not all boards have the zephyr_h264enc and zephyr_h264enc in their device tree.

Fixes #98275

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[hakehuang]

regression build on all NXP platform pass

[JarmouniA]

There should be a platform_allow list, otherwise I believe it will still be built for other platforms, just without applying the extra_args.

[dleach02]

There should be a platform_allow list, otherwise I believe it will still be built for other platforms, just without applying the extra_args.

@JarmouniA, It will only be built if the dt_chosen_enabled("zephyr,camera") is true.

[JarmouniA]

@JarmouniA, It will only be built if the dt_chosen_enabled("zephyr,camera") is true.

Of crs, but that's not enough. The platform should have an H264/JPEG encoder for those 2 scenarios to be relevant.

[dleach02]

@JarmouniA, It will only be built if the dt_chosen_enabled("zephyr,camera") is true.

Of crs, but that's not enough. The platform should have an H264/JPEG encoder for those 2 scenarios to be relevant.

I had a version of this PR that also added a DT filter for H264 and JPEG but twister was still failing because it generates the final DTS before doing the filter tests. So this PR reflects the change needed to allow twister to build the DTS and that ended up being all that was needed because the zephyr,camera was not enabled then in these sample targets.