contrib/gitdm: un-ironically add a mapping for LWN

I think this mainly comes from kernel-doc stuff imported into the QEMU
tree.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Message-Id: <20210720232703.10650-14-alex.bennee@linaro.org>

contrib/gitdm/domain-map

@@ -18,6 +18,7 @@ ibm.com         IBM
 igalia.com      Igalia
 intel.com       Intel
 linaro.org      Linaro
+lwn.net         LWN
 microsoft.com   Microsoft
 mvista.com      MontaVista
 nokia.com       Nokia