watchdog: Add a driver for the Apple watchdog

This driver supports the watchdog timer found on Apple's M1 SoC.
On systems that use these SoC, the watchdog timer is the primary
way to reboot the system.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Sven Peter <sven@svenpeter.dev>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-on: Apple M1 Macbook
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index f4bd3d7..6ae81c5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -116,6 +116,7 @@
 F:	configs/apple_m1_defconfig
 F:	drivers/iommu/apple_dart.c
 F:	drivers/pinctrl/pinctrl-apple.c
+F:	drivers/watchdog/apple_wdt.c
 F:	include/configs/apple.h
 
 ARM