MAINTAINERS: Add maintainer to the TCG/i386 subsystem

Richard obviously maintains this subdirectory, make this official :)

Remove the qemu-devel@nongnu.org entry because the list is always
selected by the 'All patches CC here' section.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index a1ceccf..8c217d8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2232,7 +2232,7 @@
 F: disas/arm.c
 
 i386 target
-L: qemu-devel@nongnu.org
+M: Richard Henderson <rth@twiddle.net>
 S: Maintained
 F: tcg/i386/
 F: disas/i386.c