As per this Dell support page you cannot update your TPM to 2.0. But that is not the only thing holding back your system from a Windows 11 update. You have, according to the spec sheet for the 5547. a 4th generation CPU. Windows 11 only supports generation 8 and newer. Now there were 3 exceptions to this with 7th generation CPU models but that still leaves your 5547 as unsupported. This YouTube video has more information on unsupported CPUs and Windows 11.
I have Dell inspiron 5547 which I bought it in December 2014. Can somebody help me on how I can update it to TPM 2.0 for Windows 11?
Inspiron 5547, Windows 11, TPM 2.0?