Added additional support for ECP for PSA_CRYPTO_CONFIG

The KEY_TYPE_ECC_KEY_PAIR and KEY_TYPE_ECC_PUBLIC_KEY were previously
being guarded by MBEDTLS_ECP_C in the PSA crypto library code. This change
moves it to the new MBEDTLS_PSA_BUILTIN_xxx and separates KEY_PAIR
and PUBLIC_KEY as needed. Tests have also been added to validate the new
settings.

Signed-off-by: John Durkop <john.durkop@fermatsoftware.com>
diff --git a/include/psa/crypto_config.h b/include/psa/crypto_config.h
index 8549813..c7605aa 100644
--- a/include/psa/crypto_config.h
+++ b/include/psa/crypto_config.h
@@ -53,6 +53,8 @@
 #define PSA_WANT_ALG_ECDSA                      1
 #define PSA_WANT_ALG_DETERMINISTIC_ECDSA        1
 #define PSA_WANT_ALG_ECDH                       1
+#define PSA_WANT_ECC_KEY_PAIR                   1
+#define PSA_WANT_ECC_PUBLIC_KEY                 1
 #define PSA_WANT_ALG_HMAC                       1
 #define PSA_WANT_ALG_HKDF                       1
 #define PSA_WANT_ALG_RSA                        1