GPIO descriptor fixes (#578)

Drivers/st7796-module/source/st7796.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 },
+        // ST7796's reset line is fixed active-low in hardware.
+        .flags = { .reset_active_high = false },
         .vendor_config = nullptr,
     };