Remove struct sd dependency from pac_find_sof() function implementation.
This step prepares separation of pac7302 and pac7311 specific parts of
struct sd.
Signed-off-by: NMarton Nemeth <nm127@freemail.hu>
Signed-off-by: NJean-Francois Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>