* [E1031] add platform specific reboot command support
Why I did it
E1031: add platform specific cold reboot support
How I did it
Use the CPLD to trigger board level power cycle when cold reboot
How to verify it
Do reboot stress test and check the reboot cause history
* [E1031] try to umount filesystem before power cycle reboot
* [E1031] remove fstrim in customized reboot script
