fapi/tests: Clear PCR 16 after setting it
fapi/tests: Clear PCR 16 after setting it

Subsequent tests expect PCR 16 to be clear so clean up after setting it
in the testcase.

Signed-off-by: Ross Lagerwall <d769abb2ab51a4b3c6d56e5ec4ccdd860b82f07a@citrix.com>

tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss