It appears that OF ID table was hanging around without being attached
to the driver. Attach it properly.

Fixes: b4c7715c ("power: supply: add CellWise cw2015 fuel gauge driver")
Reported-by: Nkbuild test robot <lkp@intel.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-By: NTobias Schramm <t.schramm@manjaro.org>
Tested-By: NTobias Schramm <t.schramm@manjaro.org>
Signed-off-by: NSebastian Reichel <sebastian.reichel@collabora.com>