MAINTAINERS: Add entries for include/net/ files

The include/net/ files correspond to the files in the net/ directory,
thus there should be corresponding entries in the MAINTAINERS file.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9d0255c..c47709d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1123,6 +1123,7 @@
 M: Jason Wang <jasowang@redhat.com>
 S: Maintained
 F: net/
+F: include/net/
 T: git git://github.com/jasowang/qemu.git net
 
 Netmap network backend
@@ -1222,6 +1223,7 @@
 S: Maintained
 F: slirp/
 F: net/slirp.c
+F: include/net/slirp.h
 T: git git://git.kiszka.org/qemu.git queues/slirp
 
 Tracing