Revert "DiBxxxx: get rid of DMA buffer on stack"

This reverts commit 673de951 which was
commit 5a0deeed upstream.

Based on comments from users, this broke things.

Acked-by: Olivier Grenie <Olivier.Grenie@dibcom.com>
Cc: Florian Mickler <florian@mickler.org>
Cc: Patrick Boettcher <patrick.boettcher@dibcom.fr>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>