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/configs/sandbox_noblk_defconfig b/configs/sandbox_noblk_defconfig
index 26183af..b30e165 100644
--- a/configs/sandbox_noblk_defconfig
+++ b/configs/sandbox_noblk_defconfig
@@ -131,7 +131,7 @@
 CONFIG_DM_PMIC_PFUZE100=y
 CONFIG_DM_PMIC_MAX77686=y
 CONFIG_PMIC_PM8916=y
-CONFIG_PMIC_RK808=y
+CONFIG_PMIC_RK8XX=y
 CONFIG_PMIC_S2MPS11=y
 CONFIG_DM_PMIC_SANDBOX=y
 CONFIG_PMIC_S5M8767=y
@@ -141,7 +141,7 @@
 CONFIG_DM_REGULATOR_PFUZE100=y
 CONFIG_DM_REGULATOR_MAX77686=y
 CONFIG_DM_REGULATOR_FIXED=y
-CONFIG_REGULATOR_RK808=y
+CONFIG_REGULATOR_RK8XX=y
 CONFIG_REGULATOR_S5M8767=y
 CONFIG_DM_REGULATOR_SANDBOX=y
 CONFIG_REGULATOR_TPS65090=y