android: binder: Disable preemption while holding the global binder l…

…ock.

BUG=b:24941443
TEST=boot smaug

Change-Id: I90fe02cdedb8a5677b900a68528fb443b9204322
Signed-off-by: Riley Andrews <riandrews@google.com>
Signed-off-by: Patrick Tjin <pattjin@google.com>
Signed-off-by: Tim Murray <timmurray@google.com>
Reviewed-on: https://chromium-review.googlesource.com/305736
Commit-Ready: Andrew Bresticker <abrestic@chromium.org>
Tested-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Andrew Bresticker <abrestic@chromium.org>