ARM: dts: STiHxxx-b2120: update gpio specifier

Remove useless gpio-cells
Add second parameter to indicate if gpio is active high
or low.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

arch/arm/boot/dts/stihxxx-b2120.dtsi

@@ -18,14 +18,12 @@ sbc_serial0: serial@9530000 {
 		leds {
 			compatible = "gpio-leds";
 			red {
-				#gpio-cells = <2>;
 				label = "Front Panel LED";
-				gpios = <&pio4 1 0>;
+				gpios = <&pio4 1 GPIO_ACTIVE_HIGH>;
 				linux,default-trigger = "heartbeat";
 			};
 			green {
-				#gpio-cells = <2>;
-				gpios = <&pio1 3 0>;
+				gpios = <&pio1 3 GPIO_ACTIVE_HIGH>;
 				default-state = "off";
 			};
 		};