pmic: pmic_hi6553: Add a driver for the hi6553 pmic found on hikey board.

This adds a simple pmic driver for the hi6553 pmic which is used in
conjunction with the hi6220 SoC on the hikey board. Eventually this
driver will be updated to be a proper UCLASS PMIC driver which
can parse the voltages direct from device tree.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 25b3f92..99c5778 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -23,3 +23,4 @@
 obj-$(CONFIG_POWER_TPS65218) += pmic_tps62362.o
 obj-$(CONFIG_POWER_TPS65218) += pmic_tps65218.o
 obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
+obj-$(CONFIG_POWER_HI6553) += pmic_hi6553.o