Sysupgrade adapted from the bcm47xx one. Add a hook to disable watchdog before upgrading. Signed-off-by: Frédéric Moulins <ffrrrr@gmail.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12694 3c298f89-4303-0410-b956-a3cf2f4a3e73
