fix: set FT5x06 touchscreen threshold to reduce phantom touch events (#58)

The edt-ft5406 touchscreen node had no threshold property, leaving the
chip at its hardware default of 0 (zero noise rejection). This makes
the controller susceptible to phantom touch events from EMI or power
supply ripple, which users report as the device randomly opening the
Settings screen without physical interaction.

Set threshold to 40 to provide reasonable noise rejection while
maintaining touch responsiveness.

Author: adamshiervani

sysdrv/source/kernel/arch/arm/boot/dts/rv1106g-jetkvm-v2.dts

@@ -129,6 +129,7 @@
 		reset-gpios = <&gpio2 RK_PA3 GPIO_ACTIVE_LOW>;
 		touchscreen-size-x = <240>;
 		touchscreen-size-y = <300>;
+		threshold = <40>;
 		touch_type = <1>;
  	};
 };