remove-minimal: libxml2 needed for some devices

remove-minimal.xml

@@ -124,7 +124,6 @@
     <remove-project name="platform/external/libvncserver" />
     <remove-project name="platform/external/libvpx" />
     <remove-project name="platform/external/libvterm" />
-    <remove-project name="platform/external/libxml2" />
     <remove-project name="platform/external/libyuv" />
     <remove-project name="platform/external/linux-kselftest" />
     <remove-project name="platform/external/lisa" />