Camera: Change the postview from last preview buffer to VFE2 output for
7630 and 8660.

Remove using last preview frame as post view for 7630 and 8660. Configure and use
VFE other output for postview instead.

CRs-Fixed: 253231

Change-Id: I03fdb144624f22ddd1a13958dc0ded4c317f05af
2 files changed