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

This reverts commit 2e2e9b3d 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: Icdf2b06df07b5c5b7990dc0104137d206dba4855
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>