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u-boot: Increase timeout for MediaTek Watchdog

Nícolas F. R. A. Pradorequested to merge
nfraprado/mediatek-boot:lava-u-boot-mtk-wdt-timeout-fix into main

The Genio 350 EVK board would sometimes reset while booting the kernel. It turns out that the maximum watchdog timeout was incorrectly set, only giving it 15 seconds to load all artifacts, boot the kernel and probe the watchdog driver, otherwise getting reset. Add a patch to fix this timeout, which doubles the time and gives it a bit more wiggle room.

Note that this watchdog driver is common for all MediaTek SoCs, but we currently only enable it for Genio 350 so that's why that was the only one affected.

Signed-off-by: Nícolas F. R. A. Prado nfraprado@collabora.com

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