mpeg2: remove unused includes from header

The MPEG2 header doesn't need any header, since it's only using pointers.
Remove them, and add them to the mpeg2 file when needed.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

src/mpeg2.c

@@ -23,8 +23,10 @@
  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#include "context.h"
 #include "sunxi_cedrus.h"
 #include "mpeg2.h"
+#include "surface.h"
 
 #include <assert.h>
 #include <string.h>