power_supply: ab8500: use default_groups in kobj_type

There are currently 2 ways to create a set of sysfs files for a
kobj_type, through the default_attrs field, and the default_groups
field.  Move the ab8500 power supply sysfs code to use default_groups
field which has been the preferred way since aa30f47c ("kobject: Add
support for default attribute groups to kobj_type") so that we can soon
get rid of the obsolete default_attrs field.

Cc: Sebastian Reichel <sre@kernel.org>
Cc: linux-pm@vger.kernel.org
Link: https://lore.kernel.org/r/20211229140908.2523513-1-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>