tools: libxendevicemodel: Restore symbol versions for 1.0

tools: libxendevicemodel: Restore symbol versions for 1.0

In 1462f9ea8f4219d520a530787b80c986e050aa98
"tools: libxendevicemodel: Provide xendevicemodel_shutdown"
we added a new version 1.1 to the symbol map and simply abolished
the old one.  That is quite wrong.

Instead, we should have left the 1.0 map alone and added a new version
which simply adds the new symbol.

Fix this.

Reported-by: Ross Lagerwall <ross.lagerwall@citrix.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Reviewed-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>