[media] coda: alert userspace about macroblock errors

If the CODA reports macroblock errors, also set the VB2_BUF_STATE_ERROR flag
to alert userspace.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>