ACPI / battery: move some ACPI_BATTERY_* definitions to header

ACPI_BATTERY_CLASS is used in multiple places.
Also, I'll use ACPI_BATTERY_NOTIFY_STATUS inside AC driver in
one of following patches.

So, create a header file and move ACPI_BATTERY_CLASS and
ACPI_BATTERY_NOTIFY_* definitions into it.
Also, remove copy of ACPI_BATTERY_CLASS from sbs.c

Signed-off-by: Alexander Mezin <mezin.alexander@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 797a693..bfec70f 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -39,15 +39,13 @@
 #include <linux/acpi.h>
 #include <linux/power_supply.h>
 
+#include "battery.h"
+
 #define PREFIX "ACPI: "
 
 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
 
-#define ACPI_BATTERY_CLASS		"battery"
 #define ACPI_BATTERY_DEVICE_NAME	"Battery"
-#define ACPI_BATTERY_NOTIFY_STATUS	0x80
-#define ACPI_BATTERY_NOTIFY_INFO	0x81
-#define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
 
 /* Battery power unit: 0 means mW, 1 means mA */
 #define ACPI_BATTERY_POWER_UNIT_MA	1