tss2_tpm2_types: Fix definition of PCR_LAST.
tss2_tpm2_types: Fix definition of PCR_LAST.

See part 2 of the spec, table 30. In its previous form any use of the
PCR_LAST macro produced an error since IMPLEMENTATION_PCR1 was
undefined. Should have been IMPLEMENTATION_PCR - 1.

Signed-off-by: Philip Tricca <fd418754d31777cf39b16b99b0350486ab840079@intel.com>

tpm2-software/tpm2-tss,01org/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss