How can I uninstall the FTDIUSBSerialDriver?
First, find out if the package is installed, and it's name:

pkgutil --pkgs | grep -i ftdi


It should output:

com.FTDI.driver.FTDIUSBSerialDriver


Then get a list of files:

pkgutil --files com.FTDI.driver.FTDIUSBSerialDriver


In my case, this was the result:

Library  
Library/Extensions  
Library/Extensions/FTDIUSBSerialDriver.kext  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/Info.plist  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/MacOS  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/MacOS/FTDIUSBSerialDriver  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/Resources  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/Resources/English.lproj  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/Resources/English.lproj/InfoPlist.strings  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/_CodeSignature  
Library/Extensions/FTDIUSBSerialDriver.kext/Contents/_CodeSignature/CodeResources  


Then simply delete the files in question:

sudo rm -r /Library/Extensions/FTDIUSBSerialDriver.kext


And follow it up with "forgetting" the package:

sudo pkgutil --forget com.FTDI.driver.FTDIUSBSerialDriver