ARM: STi: DT: STiH407: Fix retime pin mask for PIO5 and PIO35

This will avoid programming the retime registers when not implemented

- PIO5  : no retime registers assigned to pins 6 and 7
- PIO35 : pin 7 is reserved so no retime register assigned to it
Signed-off-by: Karim BEN BELGACEM <karim.ben-belgacem@st.com>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>

arch/arm/boot/dts/stih407-pinctrl.dtsi

@@ -104,6 +104,7 @@ pio5: gpio@09615000 {
 				#interrupt-cells = <2>;
 				reg = <0x5000 0x100>;
 				st,bank-name = "PIO5";
+				st,retime-pin-mask = <0x3f>;
 			};
 
 			rc {
@@ -519,6 +520,7 @@ pio35: gpio@09225000 {
 				#interrupt-cells = <2>;
 				reg = <0x5000 0x100>;
 				st,bank-name = "PIO35";
+				st,retime-pin-mask = <0x7f>;
 			};
 
 			i2c4 {