To avoid collisions with future ioctls that may be added to ion, msm-specific ioctls should use the `custom_ioctl' interface provided by struct ion_device, as originally intended. Change-Id: I68d32b81c7691fd3f54f38acfdc17fee2573bc44 Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>