Revert "drm/framebuffer: Acquire internal references on GEM handles"

This reverts commit 065bd940 which is
commit f6bfc9af upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I50726a8b1e794623deb0811160b8effc5284d703
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>