Nope. You only need to have the pool configured (that has some capacity assigned to it) in the tiers/policies and if warranted FAST VP will promote some data to it. There is no requirement to have devices initially bound to a pool to enable it for use in FAST VP.
I have got a Vmax 20K which has 3 tiers EFD FC and Sata I want to setup FAST VP to use all 3 tiers the initial set up was that  the array was setup with TDEV on both the sata and FC pools and none on the EFC disk It only had data devices on the EFD pool  Do I have to create tdevs on the EFD pool in order to also use the EFD pool ?
Help with Fast VP on VMAX