power: supply: ds2782: Use devm_delayed_work_autocancel() helper

power: supply: ds2782: Use devm_delayed_work_autocancel() helper

Use the device lifecycle managed work init function. This helps prevent
mistakes like canceling out of order in cleanup functions and
forgetting to canceling on error paths.

Note we move this to after the registering the power supply so that
the cancel is called before unregistering.

This was the last thing the .remove() function did, so remove that too.

Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20241202211519.199635-5-afd@ti.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>