@retval EFI_SUCCESS The device state was set appropriately.
@retval EFI_DEVICE_ERROR The device is not functioning correctly and could not have the setting adjusted.
@retval EFI_UNSUPPORTED The device does not support the ability to have its state set.
The SetState() function allows the input device hardware to have state settings adjusted.
@param This A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.
@param KeyToggleState Pointer to the EFI_KEY_TOGGLE_STATE to set the state for the input device.