CCID: Change cold to warm rst on PCtoRDRIccPowerOn

Before this change pcsc_scan would always receive garbage
from the stack when the reset button was pressed on the
simtrace board. Because the return value of ISO7816_GetChar
is never checked anywhere. If there is a timeout in this function,
the non-initialized local variable values which happen to be
lying around on the stack are inserted into the ATR message
and send to the host.

This only helps mitigating the symptoms but does not remove
the reason for the behavior. On the other hand, is it really
feasable to check the return value on EVERY call to
ISO7816_GetChar..?

sam3s_example/atmel_softpack_libraries/usb/device/ccid/cciddriver.c

@@ -849,7 +849,8 @@ static void PCtoRDRIccPowerOn( void )
         ccidDriver.sCcidCommand.bSpecific_0 = VOLTS_AUTO;
     }
 
-    ISO7816_cold_reset();
+    ISO7816_warm_reset();
+//    ISO7816_cold_reset();
 
     // for emulation only //JCB 
     if ( ccidDriver.sCcidCommand.bSpecific_0 != VOLTS_5_0 ) {