swtpm_setup: Report 'no-tpm12-tools' if tcsd or tpm-tools missing

swtpm_setup: Report 'no-tpm12-tools' if tcsd or tpm-tools missing

If the host is missing tcsd (trousers) or the tpm-tools, swtpm_setup
will now report the 'no-tpm12-tools' verb like this:

> swtpm_setup --print-capabilities | jq

{
  "type": "swtpm_setup",
  "features": [
    "cmdarg-keyfile-fd",
    "cmdarg-pwdfile-fd",
    "no-tpm12-tools"
  ]
}

The only TPM 1.2 setup parameter that requires interaction with
the TPM 1.2 that can be pass is then '--createek'.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>