[ce-oem] Add rs485 config handle for multiple rs485 port (BugFix)#1897

rickwu666666 merged 4 commits intomaincanonical/checkbox:mainfrom

add-rs485-config-handle-for-multiple-rs485-portcanonical/checkbox:add-rs485-config-handle-for-multiple-rs485-portCopy head branch name to clipboard