test: remove BIGNUM dependencies from pk[parse/write] suites

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/suites/test_suite_pkparse.function b/tests/suites/test_suite_pkparse.function
index 7947d3c..0d9a0c8 100644
--- a/tests/suites/test_suite_pkparse.function
+++ b/tests/suites/test_suite_pkparse.function
@@ -8,7 +8,7 @@
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES
- * depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_BIGNUM_C
+ * depends_on:MBEDTLS_PK_PARSE_C
  * END_DEPENDENCIES
  */