Lower down log level of sbus logging start message

The log message is sent in a normal sequence without any failure, so
it shouldn't be logger in the error level.

Change-Id: Ia99639df19d7ec97c42c3b365b2042a75ff66bb0

src/c/sbus/sbus.c

@@ -81,8 +81,8 @@ void sbus_start_logger( const char* str_log_level, const char* container_id )
         setlogmask( LOG_EMERG );
     else
         setlogmask( LOG_UPTO( n_level ) );
-    syslog( LOG_ERR,
-            "sbus_start_logger: Started with Level  %s",
+    syslog( LOG_DEBUG,
+            "sbus_start_logger: Started with Level %s",
             str_log_level );
 }