android: binder: deal with contexts in debugfs.

Properly print the context in debugfs entries.

Change-Id: I409a5a3854e5071bca4ad79a986c2aa129d42952
Signed-off-by: Martijn Coenen <maco@google.com>
Git-commit: 830ceaa5
Git-repo: https://git.linaro.org/kernel/linux-linaro-stable


Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>