ext/dfbvideosink: Fix build faild when not using shvio

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
ext/dfbvideosink: Fix build faild when not using shmeram

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>