GPIO descriptor fixes (#578)

Drivers/st7789-module/bindings/sitronix,st7789.yaml

@@ -67,10 +67,6 @@ properties:
     type: phandles
     default: GPIO_PIN_SPEC_NONE
     description: Reset GPIO pin
-  reset-active-high:
-    type: boolean
-    default: false
-    description: Whether the reset pin is active high
   backlight:
     type: phandle
     default: "NULL"

Drivers/st7789-module/include/drivers/st7789.h

@@ -28,7 +28,6 @@ struct St7789Config {
     uint8_t gamma_curve;
     struct GpioPinSpec pin_dc;
     struct GpioPinSpec pin_reset;
-    bool reset_active_high;
     // Optional reference to this display's backlight device, NULL if none.
     struct Device* backlight;
 };

Drivers/st7789-module/source/st7789.cpp

@@ -117,7 +117,8 @@ static error_t start(Device* device) {
         .rgb_ele_order = config->bgr_order ? LCD_RGB_ELEMENT_ORDER_BGR : LCD_RGB_ELEMENT_ORDER_RGB,
         .data_endian = LCD_RGB_DATA_ENDIAN_LITTLE,
         .bits_per_pixel = config->bits_per_pixel,
-        .flags = { .reset_active_high = config->reset_active_high },
+        // ST7789's reset line is fixed active-low in hardware.
+        .flags = { .reset_active_high = false },
         .vendor_config = nullptr,
     };