regulator: act8865: prepare support for other act88xx devices

This patch prepares support for other devices in the act88xx family of
PMUs manufactured by Active-Semi.

http://www.active-semi.com/products/power-management-units/act88xx/

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Tested-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

include/linux/regulator/act8865.h

@@ -1,5 +1,5 @@
 /*
- * act8865.h  --  Voltage regulation for the active-semi act8865
+ * act8865.h  --  Voltage regulation for active-semi act88xx PMUs
  *
  * Copyright (C) 2013 Atmel Corporation.
  *
@@ -29,6 +29,10 @@ enum {
 	ACT8865_REG_NUM,
 };
 
+enum {
+	ACT8865,
+};
+
 /**
  * act8865_regulator_data - regulator data
  * @id: regulator id