MAINTAINERS: Cover hppa-softmmu.mak in the HP-PARISC Machines section

Modifications to default-configs/hppa-softmmu.mak should be
reviewed by the hppa-softmmu users (currently a single machine).

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20200129190316.16901-1-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2596881..9d45ac2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -896,6 +896,7 @@
 M: Richard Henderson <rth@twiddle.net>
 R: Helge Deller <deller@gmx.de>
 S: Odd Fixes
+F: default-configs/hppa-softmmu.mak
 F: hw/hppa/
 F: pc-bios/hppa-firmware.img