smdk4412: add more schedulers

Authors of these schedulers are different.
But since I pulled these from psndna88's repos,
I added him as author.

This updates ROW to V4.
This tweaks SIO a bit.
Adds V(R) authored by Aaron Carroll <aaronc@gelato.unsw.edu.au>.

Add BFQ v6r2 authored by
-Jens Axboe <axboe@kernel.dk>
-Fabio Checconi <fabio@gandalf.sssup.it>
-Paolo Valente <paolo.valente@unimore.it>
and improved by Arianna Avanzini <avanzini.arianna@gmail.com>

Change-Id: I9b986b3c1444e73f54590c4d41ecdd88649a426c