test_suite_pk: remove leftover comment

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/suites/test_suite_pk.function b/tests/suites/test_suite_pk.function
index 946c52f..1aca4bd 100644
--- a/tests/suites/test_suite_pk.function
+++ b/tests/suites/test_suite_pk.function
@@ -1084,8 +1084,6 @@
 
 #if defined(MBEDTLS_RSA_C)
     if (type == MBEDTLS_PK_RSA) {
-        /* Just pick SHA1 here as hashing algorithm as we're more interested
-         * in checking the compatibility between */
         TEST_ASSERT(mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk), rsa_padding, rsa_md_alg) == 0);
     }
 #else