tpm2: unify symbolic name infra for PCRs

We so far maintained two places for symboic names for PCRs. One in
tpm2-util.h and one in tpm-pcr.h.

Let's unify this into one, i.e. move the full list from tpm2-util.h into
tpm-pcr.h, replacing the short list placed so far there.

Systematically prefix the definitions with TPM2_ or tpm2_, to follow how
we do this for all other defines in this context.

No change in behaviour, just unification of tables.

src/cryptsetup/cryptsetup.c

@@ -434,7 +434,7 @@ static int parse_one_option(const char *option) {
                                 return 0;
                         }
 
-                        pcr = r ? TPM_PCR_INDEX_VOLUME_KEY : UINT_MAX;
+                        pcr = r ? TPM2_PCR_SYSTEM_IDENTITY : UINT_MAX;
                 } else if (!TPM2_PCR_INDEX_VALID(pcr)) {
                         log_warning("Selected TPM index for measurement %u outside of allowed range 0…%u, ignoring.", pcr, TPM2_PCRS_MAX-1);
                         return 0;