build_packages: Document another dep loop

Signed-off-by: Krzesimir Nowak <knowak@microsoft.com>

Author: krnowak

build_packages

@@ -266,6 +266,7 @@ if [[ "${FLAGS_usepkgonly}" -eq "${FLAGS_FALSE}" ]]; then
   # lvm2[udev] -> virtual/udev -> systemd[cryptsetup] -> cryptsetup -> lvm2
   # lvm2[systemd] -> systemd[cryptsetup] -> cryptsetup -> lvm2
   # systemd[cryptsetup] -> cryptsetup[udev] -> virtual/udev -> systemd
+  # systemd[tpm] -> tpm2-tss -> util-linux[udev] -> virtual/udev -> systemd
   # curl[http2] -> nghttp2[systemd] -> systemd[curl] -> curl
   # sys-libs/pam[systemd] -> sys-apps/system[pam] -> sys-libs/pam
   #   not dropping pam from sys-apps/systemd, otherwise we would need