AMD wouldn't allow this, no. As soon as you use the AMD drivers; you won't have TRIM; no matter if your SSD is part of a RAID or not.
Only the Intel drivers allow running in RAID mode, while still enabling TRIM for single disk SSDs not part of a RAID array themselves.
With AS SSD you can see which driver you are running (msahci = TRIM). CrystalDiskMark also shows if TRIM is enabled.