msm:vidc: Add the support for MPEG-2 extension and user data

Support is added for MPEG-2 extension and user data. With this
changes Core returns extension and user data as an extradata.

Change-Id: I66a230aa651dabafa883625ce9f687d5c35b8671
Signed-off-by: Shobhit Pandey <cshopan@codeaurora.org>
Signed-off-by: Neha Pandey <nehap@codeaurora.org>

Conflicts:
	drivers/video/msm/vidc/1080p/ddl/vcd_ddl.h
	drivers/video/msm/vidc/1080p/ddl/vcd_ddl_helper.c
	drivers/video/msm/vidc/1080p/ddl/vcd_ddl_metadata.c
	drivers/video/msm/vidc/1080p/ddl/vcd_ddl_shared_mem.c
	drivers/video/msm/vidc/1080p/ddl/vcd_ddl_shared_mem.h
	include/linux/msm_vidc_dec.h
	include/media/msm/vcd_property.h
msm: vidc: Remove kernel mapping on input/output buffers

This change will remove the kernel mapping of input and
output buffers for both video encoder and decoder to
avoid the errors resulting from ion_map_kernel() for
high resolution video concurrency use cases due to the
limited vmalloc space. It also removed the metadata
processing in kerner video driver as kernel virtual
address is removed. The metadata processing can be
done in user space video component.

Change-Id: I3f2c9b7c13b3e09097ce07ca7b59154b97401052
CRs-fixed: 471135
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>

Conflicts:
	drivers/video/msm/vidc/1080p/ddl/vcd_ddl_helper.c
	drivers/video/msm/vidc/1080p/ddl/vcd_ddl_metadata.c
	drivers/video/msm/vidc/common/dec/vdec.c
	drivers/video/msm/vidc/common/init/vidc_init.c
msm: vidc: Add LTR feature for H264 encoder

This change adds Long Term Reference picture
selection feature for H264 video encoder.

Change-Id: Ida957df244d8715c955afe8d809708123a94e999
Signed-off-by: Maheshwar Ajja <majja@codeaurora.org>

Conflicts:
	include/linux/msm_vidc_enc.h
	include/media/msm/vcd_property.h
msm: vidc: Initialize kernel space stack variables

This change initializes kernel space stack variables
that are passed between kernel space and user space
using ioctls.
Non initialization of these variables may lead to
leakage of memory values from the kernel stack to
user space.

Change-Id: Icb195470545ee48b55671ac09798610178e833e1
CRs-fixed: 556771,563420
Signed-off-by: Deepak Verma <dverma@codeaurora.org>