Revert "vfio/platform: check the bounds of read/write syscalls"

This reverts commit 61ba5181.

It had been committed multiple times to the tree, and isn't needed
again.

Link: https://lore.kernel.org/r/a082db2605514513a0a8568382d5bd2b6f1877a0.camel@cyberus-technology.de


Reported-by: Stefan Nürnberger <stefan.nuernberger@cyberus-technology.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>