power: rk808: rename to rk8xx

Since this driver can be used for rk8xx series pmic,
let's rename rk808 to rk8xx, to make it clear.

Configs parts are done by sed -i "s/RK808/RK8XX/g" `grep RK808 -lr ./`

Signed-off-by: Jacob Chen <jacob-chen@iotwrt.com>
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 5f1bef3..f409e3a 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -15,7 +15,7 @@
 obj-$(CONFIG_PMIC_AS3722) += as3722.o
 obj-$(CONFIG_PMIC_MAX8997) += max8997.o
 obj-$(CONFIG_PMIC_PM8916) += pm8916.o
-obj-$(CONFIG_PMIC_RK808) += rk808.o
+obj-$(CONFIG_PMIC_RK8XX) += rk8xx.o
 obj-$(CONFIG_PMIC_RN5T567) += rn5t567.o
 obj-$(CONFIG_PMIC_TPS65090) += tps65090.o
 obj-$(CONFIG_PMIC_S5M8767) += s5m8767.o