All Zen 1 CPUs and newer have the PSP / ASP security processor which is ARM based and runs before the x86 cores are released from reset. This applies to all Zen models, not just the PRO versions.
The fTPM does indeed run on the PSP, so on the ARM cores, among many other things like DRAM training.
The fTPM does indeed run on the PSP, so on the ARM cores, among many other things like DRAM training.