regulator: rk8xx: remove unused functions

Those two functions had their last user removed in commit f9c68a566c4d
("rockchip: phycore_rk3288: remove phycore_init() function") part of
v2023.01 release, so let's do some cleanup here.

Cc: Quentin Schulz <foss+uboot@0leil.net>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
diff --git a/drivers/power/regulator/rk8xx.c b/drivers/power/regulator/rk8xx.c
index e80bd6c..97d73ac 100644
--- a/drivers/power/regulator/rk8xx.c
+++ b/drivers/power/regulator/rk8xx.c
@@ -210,14 +210,6 @@
 };
 #endif
 
-static const u16 rk818_chrg_cur_input_array[] = {
-	450, 800, 850, 1000, 1250, 1500, 1750, 2000, 2250, 2500, 2750, 3000
-};
-
-static const uint rk818_chrg_shutdown_vsel_array[] = {
-	2780000, 2850000, 2920000, 2990000, 3060000, 3130000, 3190000, 3260000
-};
-
 static const struct rk8xx_reg_info *get_buck_reg(struct udevice *pmic,
 						 int num, int uvolt)
 {
@@ -1160,26 +1152,3 @@
 
 	return _buck_set_enable(pmic, buck, true);
 }
-
-int rk818_spl_configure_usb_input_current(struct udevice *pmic, int current_ma)
-{
-	uint i;
-
-	for (i = 0; i < ARRAY_SIZE(rk818_chrg_cur_input_array); i++)
-		if (current_ma <= rk818_chrg_cur_input_array[i])
-			break;
-
-	return pmic_clrsetbits(pmic, REG_USB_CTRL, RK818_USB_ILIM_SEL_MASK, i);
-}
-
-int rk818_spl_configure_usb_chrg_shutdown(struct udevice *pmic, int uvolt)
-{
-	uint i;
-
-	for (i = 0; i < ARRAY_SIZE(rk818_chrg_shutdown_vsel_array); i++)
-		if (uvolt <= rk818_chrg_shutdown_vsel_array[i])
-			break;
-
-	return pmic_clrsetbits(pmic, REG_USB_CTRL, RK818_USB_CHG_SD_VSEL_MASK,
-			       i);
-}
diff --git a/include/power/rk8xx_pmic.h b/include/power/rk8xx_pmic.h
index 3cbfc02..0db8241 100644
--- a/include/power/rk8xx_pmic.h
+++ b/include/power/rk8xx_pmic.h
@@ -233,7 +233,5 @@
 };
 
 int rk8xx_spl_configure_buck(struct udevice *pmic, int buck, int uvolt);
-int rk818_spl_configure_usb_input_current(struct udevice *pmic, int current_ma);
-int rk818_spl_configure_usb_chrg_shutdown(struct udevice *pmic, int uvolt);
 
 #endif