ENGR00219397-1 v4l2 overlay: Add foreground overlay support based on ipu device

ENGR00219397-1 v4l2 overlay: Add foreground overlay support based on ipu device

Replace CSI_PRP_VF_MEM channel with CSI_MEM, then using ipu device
to do the processing or directly send to framebuffer if no processing
need to be perform.

Add the foreground overlay driver file name ipu_fg_overlay_sdc.c correspondding
to the former ipu_prp_vf_sdc.c

Discard the cam->vf_rotation parametter when uing the ipu device for processing
in the overlay, share the cam->rotation parametter with pp.

Signed-off-by: Yuxi sun <b36102@freescale.com>