FROMLIST: binder: use inner lock to sync work dq and node counts

FROMLIST: binder: use inner lock to sync work dq and node counts

(from https://patchwork.kernel.org/patch/9817789/)

For correct behavior we need to hold the inner lock when
dequeuing and processing node work in binder_thread_read.
We now hold the inner lock when we enter the switch statement
and release it after processing anything that might be
affected by other threads.

We also need to hold the inner lock to protect the node
weak/strong ref tracking fields as long as node->proc
is non-NULL (if it is NULL then we are guaranteed that
we don't have any node work queued).

This means that other functions that manipulate these fields
must hold the inner lock. Refactored these functions to use
the inner lock.

Change-Id: I90cb6e39a3fecf4809a0828aa3a4f3199b38b209
Signed-off-by: Todd Kjos <tkjos@google.com>