gnss_uorb.c: update upper->parsebuffer every new line

When the last data sent by the driver does not contain \n\r,
it will cause a GAA parsing error

Signed-off-by: chenzihan1 <chenzihan1@xiaomi.com>

drivers/sensors/gnss_uorb.c

@@ -595,6 +595,7 @@ static void gnss_parse(FAR struct gnss_upperhalf_s *upper,
     {
       if (*buffer == '$')
         {
+          upper->parsenext = 0;
           newline = true;
         }