simtrace2-remsim: Use simplest ATR

this ATR does not encode any data and uses all defaults.
the lower default speed is also better handled by the hardware.
handling faster speeds is upcoming.

Change-Id: I5a4f2f94bea1a15aedbef5a6f2f49344387dc11d

host/src/simtrace2-remsim.c

@@ -432,9 +432,7 @@ int main(int argc, char **argv)
 
 		if (!skip_atr) {
 			/* set the ATR */
-			uint8_t real_atr[] = {  0x3B, 0x9F, 0x96, 0x80, 0x1F, 0xC7, 0x80, 0x31,
-						0xA0, 0x73, 0xBE, 0x21, 0x13, 0x67, 0x43, 0x20,
-						0x07, 0x18, 0x00, 0x00, 0x01, 0xA5 };
+			uint8_t real_atr[] = {  0x3B, 0x00 }; // the simplest ATR
 			atr_update_csum(real_atr, sizeof(real_atr));
 			osmo_st2_cardem_request_set_atr(ci, real_atr, sizeof(real_atr));
 		}