22.4.3 SetControl() and GetControl() Implementation
SetControl()are used to view and modify respectively the control bits on the serial device. All of the values listed in the following table can be read back with
GetControl(), but some cannot be modified with
SetControl(). If a non-modifiable bit is attempted to be set with
EFI_UNSUPPORTEDmust be returned.
Modepointer should be updated in this function when success has been determined, but not modified if there is an error.