vpu: decoder: fixed gcc warnings

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
vpu: encoder: added quantization parameter property to h.264 encoder

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
vpu: encoder: added MPEG-4 part 2 encoder element

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
vpu: encoder: added h.263 encoder element

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>