USB: move help config flag to FW

Note: This cl is copied from aosp/1785174 since
merge conflict issue.

Move the flag for the indication of the validity of help links
to framework because it is also needed for SystemUI.

config_has_help will be replaced by config_settingsHelpLinksEnabled
in frameworks.

Test: $ adb shell dumpsys usb add-port "matrix" ufp
$ adb shell dumpsys usb set-contaminant-status "matrix" true
Bug: 195448626

Change-Id: Id9b0c196c9a07085c790d5f4366bb1fec635d6b1