Revert "Revert "Merge omapzoom-changes into drivers/video/omap2/dss/dispc.c""

Reverting this caused graphical artifacts. Bring back the sync to
omapzoom and leave only a problematic piece disabled which can lead
to kernel panics.

This mostly reverts commit 780543728d90e3d972e2b8261c6af131b30b92c0.

Change-Id: If01cc1d5f21ad6b90ddc597ebd5341bcf70e8bb5
net/l2tp: don't fall back on UDP [get|set]sockopt

The l2tp [get|set]sockopt() code has fallen back to the UDP functions
for socket option levels != SOL_PPPOL2TP since day one, but that has
never actually worked, since the l2tp socket isn't an inet socket.

As David Miller points out:

  "If we wanted this to work, it'd have to look up the tunnel and then
   use tunnel->sk, but I wonder how useful that would be"

Since this can never have worked so nobody could possibly have depended
on that functionality, just remove the broken code and return -EINVAL.

Change-Id: I5fc9d8033eb368e72436ec7682adaa1ff387615a
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: James Chapman <jchapman@katalix.com>
Acked-by: David Miller <davem@davemloft.net>
Cc: Phil Turnbull <phil.turnbull@oracle.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Merge branch 'cm-11.0' into stable/cm-11.0