tpm2_policypcr: ensure -S and -L are specified
tpm2_policypcr: ensure -S and -L are specified

Both -L/--set-list and -S/--session are required options, print usage
information if one of the options is missing.

Signed-off-by: Joshua Lock <9750fc34162235efa862f2505c1a01f735e97af7@intel.com>

01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools