linux v4l2 backend - method get_devname_from_video_path efficiency improved

[remibettan]

Tracked by: RSDSO-19712

[dmipx]

it is not necessarily needed - after all - we append /dev/:
auto mipi_dfu_chardev = "/dev/" + dfu_device_path;

[remibettan]

great - thanks

[dmipx]

Excellent!

[ciandonovan]

URGENT—broke production librealsense in unprivileged containers

This PR undid the work of #11900 to make librealsense usable in unprivileged containers, and since being backported to Jazzy has broken our prod.

What was this PR in aid of? What efficiency improvements did it provide? Can it be reverted ASAP?

[Nir-Az]

URGENT—broke production librealsense in unprivileged containers

This PR undid the work of #11900 to make librealsense usable in unprivileged containers, and since being backported to Jazzy has broken our prod.

What was this PR in aid of? What efficiency improvements did it provide? Can it be reverted ASAP?

@ciandonovan Sorry for the inconvenience, and for the hard work that was done by you and got changed later on.
We will try to assist as best as we can, the changes were done when we fixed an issue of slow enumeration when multiple cameras are connected that occurs after that change.
We sent an offline mail to get more details so we can reproduce and find a way that will, hopefully this time we can also add a regression test that will keep your use case valid on next releases.

For now I can suggest you to pin point 2.55.1 / 4.55.1 versions on your build in order to keep your system stable and allow us time to investigate and solve the issue properly.