vidc: vdec: Pass alignment flag to mapping api's.

Mapping api by default assumes 4K alignment.
Video core requires output buffer to be aligned
to 8K.This change will pass aligment information to
the mapper API.

Signed-off-by: Gopikrishnaiah Anandan <gopikr@codeaurora.org>

Conflicts:

	drivers/video/msm/vidc/common/init/vidc_init.c