amd64: Remove tpm(4) from GENERIC for now

It breaks suspend/resume and no one has had time to investigate and fix
it.

PR: 291067
Reviewed by: emaste
Fixes: 3deb21f1afd5 ("random: TPM_HARVEST should have been named RANDOM_ENABLE_TPM")
Differential Revision: https://reviews.freebsd.org/D54587