Solely use raw X.509 name data references including SEQUENCE header

So far, the CRT frame structure `mbedtls_x509_crt_frame` used
as `issuer_raw` and `subject_raw` the _content_ of the ASN.1
name structure for issuer resp. subject. This was in contrast
to the fields `issuer_raw` and `subject_raw` from the legacy
`mbedtls_x509_crt` structure, and caused some information
duplication by having both variants `xxx_no_hdr` and `xxx_with_hdr`
in `mbedtls_x509_crt` and `mbedtls_x509_crt_frame`.

This commit removes this mismatch by solely using the legacy
form of `issuer_raw` and `subject_raw`, i.e. those _including_
the ASN.1 name header.
diff --git a/library/x509_crl.c b/library/x509_crl.c
index f077841..5829425 100644
--- a/library/x509_crl.c
+++ b/library/x509_crl.c
@@ -428,17 +428,17 @@
         mbedtls_x509_crl_free( crl );
         return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
     }
-    crl->issuer_raw_no_hdr.p = p;
+    p += len;
+    crl->issuer_raw.len = p - crl->issuer_raw.p;
 
-    if( ( ret = mbedtls_x509_get_name( &p, p + len, &crl->issuer ) ) != 0 )
+    if( ( ret = mbedtls_x509_get_name( crl->issuer_raw.p,
+                                       crl->issuer_raw.len,
+                                       &crl->issuer ) ) != 0 )
     {
         mbedtls_x509_crl_free( crl );
         return( ret );
     }
 
-    crl->issuer_raw_no_hdr.len = p - crl->issuer_raw_no_hdr.p;
-    crl->issuer_raw.len = p - crl->issuer_raw.p;
-
     /*
      * thisUpdate          Time
      * nextUpdate          Time OPTIONAL