Add missing reboot required flag

src/AutoPilotPlugins/PX4/ParameterFactMetaData.xml

@@ -3802,6 +3802,7 @@ FW_AIRSPD_MIN * RWTO_AIRSPD_SCL</short_desc>
       <long_desc>CHANGING THIS VALUE REQUIRES A RESTART. Configures the baud rate of the companion computer interface. Set to zero to disable, set to these values to enable (NO OTHER VALUES SUPPORTED!) 921600: enables onboard mode at 921600 baud, 8N1. 57600: enables onboard mode at 57600 baud, 8N1. 157600: enables OSD mode at 57600 baud, 8N1.</long_desc>
       <min>0</min>
       <max>921600</max>
+      <reboot_required>true</reboot_required>
       <values>
         <value code="57600">Companion Link (57600 baud, 8N1)</value>
         <value code="921600">Companion Link (921600 baud, 8N1)</value>