drivers: report error_count in drivers where possible

src/drivers/ms5611/ms5611.cpp

@@ -573,6 +573,7 @@ MS5611::collect()
 	struct baro_report report;
 	/* this should be fairly close to the end of the conversion, so the best approximation of the time */
 	report.timestamp = hrt_absolute_time();
+        report.error_count = perf_event_count(_comms_errors);
 
 	/* read the most recent measurement - read offset/size are hardcoded in the interface */
 	ret = _interface->read(0, (void *)&raw, 0);