ACPI / Battery: Rename acpi_battery_quirks2 with acpi_battery_quirks

This patch is cosmetic only, and makes no functional change.
Since the acpi_battery_quirks has been deleted, rename
acpi_battery_quirks2 with acpi_battery_quirks to clean the code.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>