ServiceManager: Fix the binder interface

This patch adds support for binder transactions on 64bit systems
without breaking the existing 32bit ABI. It has been tested on
the Android emulator and ARMv8 Model.

Most of the changes in this patch just follow the binder ABI.

Change-Id: I8c37b847ea65008d56554d34d4696fe3d22f7533
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>