Revert "Sleep after sending icarus work to emulate working at 115200 baud."

This reverts commit 4aaeb510c82f93f33120cd021afcc17d3b12234f.

There is a baud emulation function now.

driver-icarus.c

@@ -894,9 +894,6 @@ static int64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 		return 0;
 	}
 
-	/* Simple attempt to emulate writing at 115200 baud */
-	nusleep(4444);
-
 	if (opt_debug) {
 		ob_hex = bin2hex(ob_bin, sizeof(ob_bin));
 		applog(LOG_DEBUG, "%s%d: sent %s",