dts: stm32: secure pins for peripherals used in the secure world

These pins are used by RCC MCO and the I2C4. As these peripherals are
used in OP-TEE, secure them.

Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

core/arch/arm/dts/stm32mp135f-dk.dts

@@ -8,6 +8,7 @@
 
 #include <dt-bindings/clock/stm32mp13-clksrc.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/gpio/stm32mp_gpio.h>
 #include <dt-bindings/regulator/st,stm32mp13-regulator.h>
 #include "stm32mp135.dtsi"
 #include "stm32mp13xf.dtsi"
@@ -82,6 +83,18 @@
 	};
 };
 
+&gpiob {
+	st,protreg = <TZPROT(9)>;
+};
+
+&gpiod {
+	st,protreg = <TZPROT(7)>;
+};
+
+&gpioe {
+	st,protreg = <TZPROT(15)>;
+};
+
 &i2c4 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c4_pins_a>;