HACK: cuart: Artificially extend WTIME by 100ms

It seems some cards / transactions take longer than we expect, see
https://osmocom.org/issues/4742

With sysmoUSIM-SJS1 a timeout of 12.5ms is sufficient.  But let's better
be tolerant here.

Change-Id: I85a7a0ae6195856fad17f249f0903f144a9aec85
Related: OS#4742

ccid_common/cuart.c

@@ -80,6 +80,9 @@ void card_uart_wtime_restart(struct card_uart *cuart)
 	/* limit lower wait time to reasonable value */
 	usecs = usecs < 300000 ? 300000 : usecs;
 
+	/* HACK: Some cards seem to take more time than specified? SO#4742 */
+	usecs += 100000;
+
 	if (usecs > 1000000) {
 		secs = usecs / 1000000;
 		usecs = usecs % 1000000;