Use DataUpdateCoordinator in london_underground (#75304)
* Use DataUpdateCoordinator in london_underground
* Update homeassistant/components/london_underground/sensor.py
Co-authored-by: avee87 <6134677+avee87@users.noreply.github.com>
* Follow up on PR comments
* Removes unused callback import
* Update homeassistant/components/london_underground/sensor.py
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
* Update homeassistant/components/london_underground/sensor.py
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
* Adds missing PlatformNotReady import
* Linting fixes
Co-authored-by: avee87 <6134677+avee87@users.noreply.github.com>
Co-authored-by: Martin Hjelmare <marhje52@gmail.com>
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