Revert "fbdev: Disable sysfb device registration when removing conflicting FBs"

This reverts commit 13d28e0c.

Commit ee7a69aa ("fbdev: Disable sysfb device registration when
removing conflicting FBs") was backported to 5.15.y LTS. This causes a
regression where all virtual consoles stop responding during boot at:

"Populating /dev with existing devices through uevents ..."

Reverting the commit fixes the regression.

Signed-off-by: Brett A C Sheffield <bacs@librecast.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>