Revert "Revert "Revert "CHROMIUM: android: binder: Fix potential scheduling-while-atomic"""

This reverts commit 6a3b9c49.

Sigh. Confusion reigns. The rest of the preempt_disable patch is not in common, so this shouldn't be here afterall (it is in several downstream branches that therefore need this one too).

Re-reverting. We don't want the preempt_disable stuff in common since fine-grained locking is coming soon.

Change-Id: I2595516cab28041fa72f4a38692266a0f2a01ab4