Remove MBEDTLS_OID_X509_EXT_xxx constants

They're just aliases for the corresponding MBEDTLS_X509_EXT_xxx. We don't
need separate names.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/x509_oid.c b/library/x509_oid.c
index f5eb8fe..0a5da54 100644
--- a/library/x509_oid.c
+++ b/library/x509_oid.c
@@ -273,47 +273,47 @@
         OID_DESCRIPTOR(MBEDTLS_OID_BASIC_CONSTRAINTS,
                        "id-ce-basicConstraints",
                        "Basic Constraints"),
-        MBEDTLS_OID_X509_EXT_BASIC_CONSTRAINTS,
+        MBEDTLS_X509_EXT_BASIC_CONSTRAINTS,
     },
     {
         OID_DESCRIPTOR(MBEDTLS_OID_KEY_USAGE,            "id-ce-keyUsage",            "Key Usage"),
-        MBEDTLS_OID_X509_EXT_KEY_USAGE,
+        MBEDTLS_X509_EXT_KEY_USAGE,
     },
     {
         OID_DESCRIPTOR(MBEDTLS_OID_EXTENDED_KEY_USAGE,
                        "id-ce-extKeyUsage",
                        "Extended Key Usage"),
-        MBEDTLS_OID_X509_EXT_EXTENDED_KEY_USAGE,
+        MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE,
     },
     {
         OID_DESCRIPTOR(MBEDTLS_OID_SUBJECT_ALT_NAME,
                        "id-ce-subjectAltName",
                        "Subject Alt Name"),
-        MBEDTLS_OID_X509_EXT_SUBJECT_ALT_NAME,
+        MBEDTLS_X509_EXT_SUBJECT_ALT_NAME,
     },
     {
         OID_DESCRIPTOR(MBEDTLS_OID_NS_CERT_TYPE,
                        "id-netscape-certtype",
                        "Netscape Certificate Type"),
-        MBEDTLS_OID_X509_EXT_NS_CERT_TYPE,
+        MBEDTLS_X509_EXT_NS_CERT_TYPE,
     },
     {
         OID_DESCRIPTOR(MBEDTLS_OID_CERTIFICATE_POLICIES,
                        "id-ce-certificatePolicies",
                        "Certificate Policies"),
-        MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES,
+        MBEDTLS_X509_EXT_CERTIFICATE_POLICIES,
     },
     {
         OID_DESCRIPTOR(MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
                        "id-ce-subjectKeyIdentifier",
                        "Subject Key Identifier"),
-        MBEDTLS_OID_X509_EXT_SUBJECT_KEY_IDENTIFIER,
+        MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER,
     },
     {
         OID_DESCRIPTOR(MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER,
                        "id-ce-authorityKeyIdentifier",
                        "Authority Key Identifier"),
-        MBEDTLS_OID_X509_EXT_AUTHORITY_KEY_IDENTIFIER,
+        MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER,
     },
     {
         NULL_OID_DESCRIPTOR,