Add compile options to libspdm_gen_x509_csr

[rw8896]

libspdm/os_stub/cryptlib_mbedtls/pk/x509.c

Line 1993 in b327ead

bool libspdm_gen_x509_csr(size_t hash_nid, size_t asym_nid,

libspdm/os_stub/cryptlib_openssl/pk/x509.c

Line 2495 in b327ead

bool libspdm_gen_x509_csr(size_t hash_nid, size_t asym_nid,

The implementation could use LIBSPDM_ENABLE_CAPABILITY_CSR_CAP to wrap the whole function.
And it should add crypto options (e.g. LIBSPDM_RSA_SSA_2048_SUPPORT) to wrap around the crypto operation code.

[steven-bellock]

@rw8896 is this to save on code size?

[rw8896]

Not really. It caused compiler errors as RSA was not enabled in my mbedtls configuration.

After looking into this function further, I think it doesn't allow the caller to specify the pathLen in basic constraints.
If that's the case, maybe pathLen should be added as a input to make this API more general?