watchdog: Convert jz4740_wdt driver to watchdog core
This patch converts jz4740_wdt driver to use watchdog core APIs. Also use devm_* APIs to save a few error handling code. Signed-off-by: NAxel Lin <axel.lin@gmail.com> Acked-by: NPaul Cercueil <paul@crapouillou.net> Reviewed-by: NWolfram Sang <w.sang@pengutronix.de> Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
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