mailmap: Update philmd email address

Use the email address where I spend most of my time.

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Message-Id: <20190822230916.576-3-philmd@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

.mailmap

@@ -32,6 +32,7 @@ Aleksandar Markovic <amarkovic@wavecomp.com> <aleksandar.markovic@imgtec.com>
 Paul Burton <pburton@wavecomp.com> <paul.burton@mips.com>
 Paul Burton <pburton@wavecomp.com> <paul.burton@imgtec.com>
 Paul Burton <pburton@wavecomp.com> <paul@archlinuxmips.org>
+Philippe Mathieu-Daudé <philmd@redhat.com> <f4bug@amsat.org>
 Yongbok Kim <yongbok.kim@mips.com> <yongbok.kim@imgtec.com>
 
 # Also list preferred name forms where people have changed their