Revert "ACPI battery: fix async boot oops"

This reverts commit 5d38258ec026921a7b266f4047ebeaa75db358e5, since the
underlying problem got fixed properly in the previous commit ("async:
Fix module loading async-work regression").

Cc: Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>
Cc: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Len Brown <len.brown@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 3c7d894..b0de631 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -903,7 +903,7 @@
 		},
 };
 
-static void acpi_battery_init_async(void *unused, async_cookie_t cookie)
+static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 {
 	if (acpi_disabled)
 		return;