Add silverstone platform module and device#94

Merged

tiantianlv merged 2 commits intoSONIC-DEV:201904_cel_wb_devfrom

pphuchar:add-silverstone-device

Jul 19, 2019

Commits on Jun 27, 2019

[platform/broadcom] Add Celestica silverstone platform module.
pphuchar
committed
[device/celestica] Add silverstone device plugins and configs
pphuchar
committed