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boot: Allow watchdog timeout to be configured #2131

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This change adds a new Kconfig option MCUBOOT_WATCHDOG_TIMEOUT to specify the watchdog timeout value. Several devices (NXP among others) require a timeout to be installed in order to enable the watchdog. On e.g. imxrt1170 enabling the watchdog without a timeout will print the error "No valid timeouts installed" and fail to setup the watchdog.

Fixes: #2093

This change adds a new Kconfig option MCUBOOT_WATCHDOG_TIMEOUT to
specify the watchdog timeout value. Several devices (NXP among others)
require a timeout to be installed in order to enable the watchdog.

Signed-off-by: Karl Kristian Dyrholm Torp <kdt@polytech.com>
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The watchdog code in mcuboot is a bit of a red herring, it does not set up a watchdog, it only feeds it. And it does not make sense to set the watchdog up every time it is fed

Signed-off-by: Karl Kristian Dyrholm Torp <kdt@polytech.com>
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Right. That was my bad. It was of cause during setup the timeout should be installed - good catch.

This is just a suggestion for the watchdog issues on NXP, we have used this method for some time. But I can see that watchdog support is limited in mcuboot and this might not be the optimal solution. That's up to you guys :)

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Incorrect initialisation of hardware watchdog
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