[Mellanox]Correct reboot cause when reboot via power cycle#15

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stephenxs wants to merge 2 commits intomasterfrom

fix-reboot-cause-via-powercycle

Commits on Oct 10, 2019

[sonic_platform]remove the handling of reset_sw_reset which indicates rebooted by software.
Stephen Sun
committed

Commits on Oct 12, 2019

[sonic_platform]Check "reset_sw_reset"
Stephen Sun
committed