[Yaffs] seq_file for procfs support

Hi,
The current /proc/yaffs support for Linux seems to be broken on 4.8, I
think because of the way read-offsets are dealt with and the limited
internal buffer (512B). Given that seq_file predates Linux 2.4, would there
be a problem just dropping support for kernels that predate this, and then
moving the whole thing over to seq_file, or are there enough legacy
installations that still require this support?

Thanks,
Andre