servo: servo_v4: add dut_usb3_en control

dut_usb3_en enables or disables the usb3 interface
passthrough on the Parade PS8742 mux.

Note that dut_hub_usb_reset should be cycled after
in order for the USB link to be reinitialized.

TEST=Check that USB3 is passed through or not.

Change-Id: I9a669a21263606b69f207f809413eb4a29c9fa3c
Commit-Ready: Nick Sanders <>
Tested-by: Nick Sanders <>
Reviewed-by: Alexandru M Stan <>
3 files changed