hw: Move i.MX watchdog driver to hw/watchdog

In preparation for a full implementation, move i.MX watchdog driver
from hw/misc to hw/watchdog. While at it, add the watchdog files
to MAINTAINERS.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Message-id: 20200517162135.110364-2-linux@roeck-us.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

include/hw/arm/fsl-imx6.h

@@ -21,7 +21,7 @@
 #include "hw/cpu/a9mpcore.h"
 #include "hw/misc/imx6_ccm.h"
 #include "hw/misc/imx6_src.h"
-#include "hw/misc/imx2_wdt.h"
+#include "hw/watchdog/wdt_imx2.h"
 #include "hw/char/imx_serial.h"
 #include "hw/timer/imx_gpt.h"
 #include "hw/timer/imx_epit.h"

include/hw/arm/fsl-imx6ul.h

@@ -24,7 +24,7 @@
 #include "hw/misc/imx7_snvs.h"
 #include "hw/misc/imx7_gpr.h"
 #include "hw/intc/imx_gpcv2.h"
-#include "hw/misc/imx2_wdt.h"
+#include "hw/watchdog/wdt_imx2.h"
 #include "hw/gpio/imx_gpio.h"
 #include "hw/char/imx_serial.h"
 #include "hw/timer/imx_gpt.h"

include/hw/arm/fsl-imx7.h

@@ -26,7 +26,7 @@
 #include "hw/misc/imx7_snvs.h"
 #include "hw/misc/imx7_gpr.h"
 #include "hw/misc/imx6_src.h"
-#include "hw/misc/imx2_wdt.h"
+#include "hw/watchdog/wdt_imx2.h"
 #include "hw/gpio/imx_gpio.h"
 #include "hw/char/imx_serial.h"
 #include "hw/timer/imx_gpt.h"