tpm: when CRB is active, select, lock it, and check addresses

tpm: when CRB is active, select, lock it, and check addresses

Do not just indicate that the probing for the CRB interface was successful
if we find it active. Instead, select it, lock it, and test the addresses
for whether they can be used (must be 32 bit).

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