audio/mobile-xmf: separate from audio/x-xmf

https://www.iana.org/assignments/media-types/audio/mobile-xmf
https://www.iana.org/assignments/media-types/audio/vnd.nokia.mobile-xmf

data/freedesktop.org.xml.in

@@ -3909,11 +3909,19 @@ command to generate the output files.
     <expanded-acronym>eXtensible Music Format</expanded-acronym>
     <magic priority="50">
       <match type="string" value="XMF_" offset="0"/>
-      <match type="string" value="\130\115\106\137\062\056\060\060\000\000\000\002" offset="0"/>
     </magic>
     <glob pattern="*.xmf"/>
     <alias type="audio/xmf"/>
-    <alias type="audio/mobile-xmf"/>
+  </mime-type>
+  <mime-type type="audio/mobile-xmf">
+    <comment>Mobile XMF audio</comment>
+    <acronym>XMF</acronym>
+    <expanded-acronym>eXtensible Music Format</expanded-acronym>
+    <magic priority="50">
+      <match type="string" value="\130\115\106\137\062\056\060\060\000\000\000\002" offset="0"/>
+    </magic>
+    <glob pattern="*.mxmf"/>
+    <alias type="audio/vnd.nokia.mobile-xmf"/>
   </mime-type>
   <mime-type type="application/x-sv4cpio">
     <comment>SV4 CPIO archive</comment>