MAINTAINERS: Replace Claudio Fontana for tcg/aarch64

Claudio's Huawei address has been defunct for quite a while.  In

  https://lists.gnu.org/archive/html/qemu-devel/2019-05/msg06872.html

he asked for his personal address to be removed as well.

I will take over officially.

Cc: Claudio Fontana <claudio.fontana@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index f8952cf..4b425d0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2392,8 +2392,7 @@
 F: tests/plugin
 
 AArch64 TCG target
-M: Claudio Fontana <claudio.fontana@huawei.com>
-M: Claudio Fontana <claudio.fontana@gmail.com>
+M: Richard Henderson <richard.henderson@linaro.org>
 S: Maintained
 L: qemu-arm@nongnu.org
 F: tcg/aarch64/