regulator: aat2870: Add AAT2870 regulator driver

Add regulator driver for AnalogicTech AAT2870.

Signed-off-by: Jin Park <jinyoungp@nvidia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 87ba2fd..040d5aa 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -44,5 +44,6 @@
 obj-$(CONFIG_REGULATOR_AB8500)	+= ab8500.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
+obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG