sdm: Notify surfaceflinger to draw S3D framebuffer target

Set S3D flag to private handle so that SurfaceFlinger can help
to draw S3D framebuffer target according to the flag in case
MDP can not handle some of S3D cases.

Change-Id: Ic39d0c0dd47c71e8a677d1e52af2c485494235b3
CRs-fixed: 999055
9 files changed