ipq806x: backport upstream wdt driver

target/linux/ipq806x/config-4.4

...4.4/009-1-watchdog-core-add-restart-handler-support.patch

...4.4/009-2-watchdog-core-add-reboot-notifier-support.patch

...atic-struct-class-watchdog_class-instead-of-pointer.patch

...atchdog-Read-device-status-through-sysfs-attributes.patch

...5-watchdog-Create-watchdog-device-in-watchdog_dev-c.patch

...e-and-maintain-variables-based-on-variable-lifetime.patch

...nter-to-watchdog-device-from-struct-watchdog_device.patch

...q806x/patches-4.4/009-8-watchdog-kill-unref-ref-ops.patch

...patches-4.4/010-1-qcom-wdt-use-core-restart-handler.patch

...2-qcom-wdt-Do-not-set-dev-in-struct-watchdog_device.patch

...ion-and-data-parameters-to-restart-handler-callback.patch

...atches-4.4/010-4-watchdog-qcom-Report-reboot-reason.patch

...d-option-for-standalone-watchdog-not-in-timer-block.patch

...g-qcom-configure-BARK-time-in-addition-to-BITE-time.patch

...atchdog-qcom-set-WDT_BARK_TIME-register-offset-to-o.patch