smdk4412-camera: Setup gralloc buffers properly

Seems to solve https://namelessrom.atlassian.net/browse/NAMELESS-71 when opening
camera after playing videos.

Tested together with:
- https://gerrit.nameless-rom.org/#/c/9064/
- https://gerrit.nameless-rom.org/#/c/12178/
- https://gerrit.nameless-rom.org/#/c/12177/

Change-Id: I6e8a481b54c14782564657492bf917fc780b6a4f