pinctrl: rockchip: Also move common set_schmitter func into per Soc file

Only some Soc need Schmitter feature, so move the
implementation into their own files.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/pinctrl/rockchip/pinctrl-rockchip.h b/drivers/pinctrl/rockchip/pinctrl-rockchip.h
index 1c6fc2c..9651e9c 100644
--- a/drivers/pinctrl/rockchip/pinctrl-rockchip.h
+++ b/drivers/pinctrl/rockchip/pinctrl-rockchip.h
@@ -271,9 +271,8 @@
 			    int pin_num, int pull);
 	int	(*set_drive)(struct rockchip_pin_bank *bank,
 			     int pin_num, int strength);
-	int	(*schmitt_calc_reg)(struct rockchip_pin_bank *bank,
-				    int pin_num, struct regmap **regmap,
-				    int *reg, u8 *bit);
+	int	(*set_schmitt)(struct rockchip_pin_bank *bank,
+			       int pin_num, int enable);
 };
 
 /**