power: supply: cw2015: Free allocated workqueue

power: supply: cw2015: Free allocated workqueue

Use devm interface so allocated workqueue will be freed during device
removal and error paths, thus fixing a memory leak.

Change is not equivalent in the workqueue itself: use non-legacy API
which does not set (__WQ_LEGACY | WQ_MEM_RECLAIM).  The workqueue is
used to read updated data from the battery, thus there is no point to
run it for memory reclaim.

Cc: stable@vger.kernel.org
Fixes: b4c7715c10c1 ("power: supply: add CellWise cw2015 fuel gauge driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260305-workqueue-devm-v2-2-66a38741c652@oss.qualcomm.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>