MAINTAINERS: Add include folder to the hw/char/ section

The "Character devices" section only covers hw/char/ but
misses the corresponding include/hw/char/ folder. Add it now.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/MAINTAINERS b/MAINTAINERS
index e80fca8..0f9c4b2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1988,6 +1988,7 @@
 R: Paolo Bonzini <pbonzini@redhat.com>
 S: Odd Fixes
 F: hw/char/
+F: include/hw/char/
 
 Network devices
 M: Jason Wang <jasowang@redhat.com>