[IOT-3140] Revert PSK callback at reset

Set default PSK callback after the reset of
secure resources

Change-Id: Ib4e768c7401247dc9dd4917ff5a611396e8e07a1
Signed-off-by: Aleksey Volkov <a.volkov@samsung.com>

resource/csdk/security/src/deviceonboardingstate.c

@@ -366,6 +366,10 @@ static bool EnterRESET(void)
     // TODO [IOT-2633]: 
     VERIFY_SUCCESS(TAG, OC_STACK_OK == ResetSecureResources(), ERROR);
 
+#if defined(__WITH_DTLS__) || defined(__WITH_TLS__)
+    VERIFY_SUCCESS(TAG, CA_STATUS_OK == CAregisterPskCredentialsHandler(GetDtlsPskCredentials), ERROR);
+#endif // __WITH_DTLS__ or __WITH_TLS__
+
     // Set doxm.deviceuuid = Mfr Default (handled above)
     // Set doxm.sct = Mfr Default ("")
     // Set doxm.oxmsel = Mfr Default ("")