MAINTAINERS: add an entry for watchdog/wdt_ib700

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

MAINTAINERS

@@ -877,6 +877,7 @@ F: hw/misc/pc-testdev.c
 F: hw/timer/hpet*
 F: hw/timer/i8254*
 F: hw/timer/mc146818rtc*
+F: hw/watchdog/wdt_ib700.c
 F: include/hw/i2c/pm_smbus.h
 F: include/hw/isa/i8257.h
 F: include/hw/timer/hpet.h