bios-tables-test: Fix "-tpmdev: invalid option"

bios-tables-test: Fix "-tpmdev: invalid option"

When configure is run with "--disable-tpm", the bios-tables-test
q35/tis test fails with "-tpmdev: invalid option".

Skip the test if CONFIG_TPM is unset.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200615135051.2213-1-eric.auger@redhat.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Fixes: 5da7c35e25 ("bios-tables-test: Add Q35/TPM-TIS test")
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>