ARM: dts: dra72/1-evm: add pcf8575 used for lcd

DRA72 and DRA718 EVM boards has a pcf8575 gpio expander
which is used for the LCD/LEDs and USB vbus detection.
Add the node for the pcf8575.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra71-evm.dts

@@ -138,6 +138,11 @@
 	};
 };
 
+&pcf_lcd {
+	interrupt-parent = <&gpio7>;
+	interrupts = <31 IRQ_TYPE_EDGE_FALLING>;
+};
+
 &pcf_gpio_21 {
 	interrupt-parent = <&gpio7>;
 	interrupts = <31 IRQ_TYPE_EDGE_FALLING>;