drivers: wdt: add SMC handler for arm-smc-wdt Linux driver

Add SMC handler to handle SMC coming from Linux arm-smc-wdt driver.
This function is meant to be called in sm_platform_handler() since
CFG_

drivers: wdt: add SMC handler for arm-smc-wdt Linux driver

Add SMC handler to handle SMC coming from Linux arm-smc-wdt driver.
This function is meant to be called in sm_platform_handler() since
CFG_WDT_SM_HANDLER_ID is going to be defined by the platforms.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

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drivers: wdt: add watchdog interface

Add necessary code to register a system watchdog. This watchdog will
then used for generic watchdog usage using a new simple watchdog interface.
This interface w

drivers: wdt: add watchdog interface

Add necessary code to register a system watchdog. This watchdog will
then used for generic watchdog usage using a new simple watchdog interface.
This interface will be used by SMC handler which will allow handling SMC
coming from the arm-smc-wdt compatible driver present in Linux.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

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