dosc: schema: fix usb source address device attribute format

Device attribute does not have dotted "portAddr" format. Instead it
has single number format described but "usbAddr" which corresponds
to device parsing code in virDomainHostdevSubsysUSBDefParseXML.

Looks like [1] mistakenly changed device format for hostdev devices.
And [2] copy-n-paste this for hostdev network interfaces.

[1] 31710a53 Modify USB port to be defined as a port path
[2] 3b1c191f conf: parse/format type='hostdev' network interfaces
Signed-off-by: NNikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

docs/schemas/domaincommon.rng

@@ -2768,7 +2768,7 @@
                         <ref name="usbAddr"/>
                       </attribute>
                       <attribute name="device">
-                        <ref name="usbPort"/>
+                        <ref name="usbAddr"/>
                       </attribute>
                     </group>
                   </choice>
@@ -4712,7 +4712,7 @@
         <ref name="usbAddr"/>
       </attribute>
       <attribute name="device">
-        <ref name="usbPort"/>
+        <ref name="usbAddr"/>
       </attribute>
     </element>
   </define>