swtpm: Use TPMPROP_TPM2_BUFFER_MAX when using a libtpms v0.11 TPM 2 To query for the buffer size, use the TPMPROP_TPM2_BUFFER_MAX when using a TPM 2. This is a new property introduced in libtpms v0.11. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>