ACPI: Battery: Add sysfs support

Refer to Documentation/power_supply_class.txt for interface description.
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/Kconfig

@@ -97,7 +97,7 @@ config ACPI_AC
 
 config ACPI_BATTERY
 	tristate "Battery"
-	depends on X86
+	depends on X86 && POWER_SUPPLY
 	default y
 	help
 	  This driver adds support for battery information through