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librem5_defconfig: Set CONFIG_PANIC_TIMEOUT to reboot immediately

Sebastian Krzyszkowiak requested to merge sebastian.krzyszkowiak/linux-next:panic into pureos/byzantium

The default behavior on kernel panic is to hang indefinitely, which isn't great for a battery powered device where investigating a panic after it happened may not even be feasible. Therefore, set up the kernel so it reboots on panic.

For debugging, this can be disabled at runtime by calling sysctl kernel.panic=0. A delay before rebooting can be set by replacing 0 with a number of seconds.

Edited by Sebastian Krzyszkowiak

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