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/regulator/Kconfig b/drivers/power/regulator/Kconfig
index f870e8b..ef057e0 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -76,11 +76,11 @@
 	features for gpio regulators. The driver implements get/set for
 	voltage value.
 
-config REGULATOR_RK808
-	bool "Enable driver for RK808 regulators"
-	depends on DM_REGULATOR && PMIC_RK808
+config REGULATOR_RK8XX
+	bool "Enable driver for RK8XX regulators"
+	depends on DM_REGULATOR && PMIC_RK8XX
 	---help---
-	Enable support for the regulator functions of the RK808 PMIC. The
+	Enable support for the regulator functions of the RK8XX PMIC. The
 	driver implements get/set api for the various BUCKS and LDOs supported
 	by the PMIC device. This driver is controlled by a device tree node
 	which includes voltage limits.