fix(poplar): use sysctrl module to reset

Use sysctrl module rather than watchdog0 to reset the entire system.
Sysctrl is more reliable and requires less resources such as clocks and
resets. Doing this also allows non-secure OS to use the watchdog.

Change-Id: I30ac2780cc70055d81b35e55e35c9cb7f58b40cc
Signed-off-by: Yang Xiwen <forbidden405@foxmail.com>
2 files changed