Fix buffering of kmsg writes

A newline delimiter is needed to have the kernel not buffer writes to
kmsg until the next write.

src/log.zig

@@ -71,7 +71,7 @@ pub fn logFn(
     stream.reset();
 
     stream.writer().print(
-        "<" ++ syslog_prefix ++ ">" ++ LOG_PREFIX ++ ": " ++ format,
+        "<" ++ syslog_prefix ++ ">" ++ LOG_PREFIX ++ ": " ++ format ++ "\n",
         args,
     ) catch {};