asn1: use the new symbol to guard dependencies of ECDSA conversion functions

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/asn1parse.c b/library/asn1parse.c
index c02b233..e33fdf7 100644
--- a/library/asn1parse.c
+++ b/library/asn1parse.c
@@ -7,7 +7,8 @@
 
 #include "common.h"
 
-#if defined(MBEDTLS_ASN1_PARSE_C) || defined(MBEDTLS_X509_CREATE_C)
+#if defined(MBEDTLS_ASN1_PARSE_C) || defined(MBEDTLS_X509_CREATE_C) || \
+    defined(MBEDTLS_PSA_UTIL_HAVE_ECDSA)
 
 #include "mbedtls/asn1.h"
 #include "mbedtls/platform_util.h"
@@ -73,7 +74,7 @@
 
     return mbedtls_asn1_get_len(p, end, len);
 }
-#endif /* MBEDTLS_ASN1_PARSE_C || MBEDTLS_X509_CREATE_C */
+#endif /* MBEDTLS_ASN1_PARSE_C || MBEDTLS_X509_CREATE_C || MBEDTLS_PSA_UTIL_HAVE_ECDSA */
 
 #if defined(MBEDTLS_ASN1_PARSE_C)
 int mbedtls_asn1_get_bool(unsigned char **p,
diff --git a/library/asn1write.c b/library/asn1write.c
index 114091d..775a9ef 100644
--- a/library/asn1write.c
+++ b/library/asn1write.c
@@ -7,7 +7,8 @@
 
 #include "common.h"
 
-#if defined(MBEDTLS_ASN1_WRITE_C) || defined(MBEDTLS_X509_USE_C)
+#if defined(MBEDTLS_ASN1_WRITE_C) || defined(MBEDTLS_X509_USE_C) || \
+    defined(MBEDTLS_PSA_UTIL_HAVE_ECDSA)
 
 #include "mbedtls/asn1write.h"
 #include "mbedtls/error.h"
@@ -62,7 +63,7 @@
 
     return 1;
 }
-#endif /* MBEDTLS_ASN1_WRITE_C || MBEDTLS_X509_USE_C */
+#endif /* MBEDTLS_ASN1_WRITE_C || MBEDTLS_X509_USE_C || MBEDTLS_PSA_UTIL_HAVE_ECDSA */
 
 #if defined(MBEDTLS_ASN1_WRITE_C)
 static int mbedtls_asn1_write_len_and_tag(unsigned char **p,
diff --git a/library/psa_util.c b/library/psa_util.c
index c78b603..9e21602 100644
--- a/library/psa_util.c
+++ b/library/psa_util.c
@@ -340,7 +340,6 @@
 
 #if defined(MBEDTLS_PSA_UTIL_HAVE_ECDSA)
 
-#if defined(MBEDTLS_ASN1_WRITE_C)
 /**
  * \brief  Convert a single raw coordinate to DER ASN.1 format. The output der
  *         buffer is filled backward (i.e. starting from its end).
@@ -451,9 +450,7 @@
 
     return 0;
 }
-#endif /* MBEDTLS_ASN1_WRITE_C */
 
-#if defined(MBEDTLS_ASN1_PARSE_C)
 /**
  * \brief Convert a single integer from ASN.1 DER format to raw.
  *
@@ -570,6 +567,5 @@
 
     return 0;
 }
-#endif /* MBEDTLS_ASN1_PARSE_C */
 
 #endif /* MBEDTLS_PSA_UTIL_HAVE_ECDSA */