android: binder: Revert fixes for preemption and locking issues

  These were hacks and no longer needed as next binder from
  android-4.4@59ff2e1 (v4.4.78) has been reworked to use
  fine-grained locking.

  This is a preparation for clean merge of binder changes from
  android-4.4@59ff2e1 (v4.4.78), which follows right after this
  commit.

Reverted changes:
=================

  773fc2f1 android: binder: use copy_from_user_preempt_disabled

  To keep the driver consistent, and until we have
  fine-grained locking in place.

  Change-Id: I90fe02cdedb8a5677b900a68528fb443b9204322
  Signed-off-by: Riley Andrews <riandrews@google.com>
  Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-4.4


  Git-commit: 5c9ce54ca3a66a57e4ebfe3ae71c5733b6bcc579
  Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>

  821e02f2 CHROMIUM: android: binder: Fix potential scheduling-while-atomica

  Commit f1e7f0a724f6 ("android: binder: Disable preemption while holding
  the global binder lock.") re-enabled preemption around most of the sites
  where calls to potentially sleeping functions were made, but missed
  __alloc_fd(), which can sleep if the fdtable needs to be resized.
  Re-enable preemption around __alloc_fd() as well as __fd_install() which
  can now sleep in upstream kernels as of commit 8a81252b ("fs/file.c:
  don't acquire files->file_lock in fd_install()").

  BUG=chrome-os-partner:44012
  TEST=Build and boot on Smaug.

  Change-Id: I9819c4b95876f697e75b1b84810b6c520d9c33ec
  Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
  Reviewed-on: https://chromium-review.googlesource.com/308582


  Reviewed-by: Stephen Barber <smbarber@chromium.org>
  Reviewed-by: Riley Andrews <riandrews@google.com>
  Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-4.4


  Git-commit: c267ff1d548ed1bdad6a08f1c70776c5e60d569e
  Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>

  e4045d60 android: binder: Disable preemption while holding the global binder lock.

  Change-Id: I90fe02cdedb8a5677b900a68528fb443b9204322
  Signed-off-by: Riley Andrews <riandrews@google.com>
  Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-4.4


  Git-commit: 5c9ce54ca3a66a57e4ebfe3ae71c5733b6bcc579
  Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>

Change-Id: Id97e04f3694d76c2b6a1e7c0dc39da15d83c2867
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>