mm-video-v4l2: use new API for Ion handles

The userspace API for Ion handles has changed slightly. Update to match
the new API.

Change-Id: I8d2fa854caf1eda51ab253903b5bca276f2da90a
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_hardware_qcom_media-caf-new into HEAD