ion: add compat_ioctl

Add a compat_ioctl to the ion driver

Change-Id: I43da387e22ff9c4a29f0159dfe9e898efc500553
Signed-off-by: Rom Lemarchand <romlem@google.com>
Git-commit: a402f70ff3c94edb73b9f5670b5a55a27b1f1f00
Git-repo: http://android.googlesource.com/kernel/common/


[mitchelh@codeaurora.org: minor conflicts due to msm Makefile changes]
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>