ACPI: battery: use driver core managed async probing

In commit 0f66af53 ("ACPI: battery: asynchronous init") the ACPI
battery driver switched to a custom async driver probing to avoid
delaying the system boot.

In the meantime the driver core gained its own async probing logic for
"slow devices which probing order is not essential for booting the system".
Switch over to the core logic and drop the custom one.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20240903-acpi-battery-async-v1-1-e4deb74fcdba@weissschuh.net


[ rjw: Changelog edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>