Keep USB line coding diagnostic only. Fix cdc connect reconfiguring UART

1

src/usb_console.c

@@ -76,7 +76,7 @@ static int show_status(void)
            (unsigned int)snapshot.line_coding.data_bits,
            parity_name(snapshot.line_coding.parity),
            stop_bits_name(snapshot.line_coding.stop_bits));
-    printf("USB line coding changes RAM only; use 'serial save' to persist it.\n");
+    printf("Host line coding is reported only; UART1 uses the serial configuration.\n");
     return 0;
 }
 
@@ -110,11 +110,7 @@ static int show_counters(void)
            counter->writer_denials,
            counter->writer_revocations,
            counter->writer_events);
-    printf("Line coding: applied=%" PRIu64 " rejected=%" PRIu64
-           " failed=%" PRIu64 " service-start-failures=%" PRIu64 "\n",
-           counter->line_coding_applied,
-           counter->line_coding_rejected,
-           counter->line_coding_failed,
+    printf("Service start failures=%" PRIu64 "\n",
            counter->service_start_failures);
     printf("Control/callback drops: control=%" PRIu64 " callback=%" PRIu64 "\n",
            counter->control_drops,