staging: android: binder: Add size_helper() macro

This patch adds size_helper() macro that will be used for indexing into
different buffers on 64bit systems where the size of particular
structures will differ depending on the userspace used (32bit /64bit).

This patch is a temporary patch that will be extended with 32bit compat
handling.

Change-Id: I5f27c531cbd8f03b9386aed1aad8da6b56cfa06e
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>
Git-commit: 8691e34407fc9c7f92752e29e14d51f72cea141b
Git-repo: git://linux-arm.org/linux-2.6-armdroid.git


Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>