this patch uses SIMPLE_DEV_PM_OPS, and drops unneeded members
from io_usrs, usrs and makes use of vb2 helepers instead.
Signed-off-by: NLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>