MagKin,   The 461-AAEN kit is indeed the kit you would need for the R540s TPM 2.0.    Hope this helps.    
Hello, we have a PowerEdge R540 and it does not contain a Trusted Platform Module. My understanding is that a TPM module can be installed separately, but I fail to verify the correct Dell part #. The closes I found is SKU 461-AAEN, Part # 1MW70, included in kit J0KPWFurther server details:210-ALZH, PowerEdge R540 Server;329-BFBK, PowerEdge R540 MLK Motherboard, V2;486-42526, PER5402a Thanks!
TPM 2.0 for Dell PowerEdge R540 platform