ion: revert to old API

The new ION API causes problems with hw video decoding. For now, change
to the old API to keep phone fully working. Depends on the kernel commit
with the same name.

Revert "Add NEW_ION_API flag"

This reverts commit f42c31ebf0f803c48082da1cfcafe0d674306e0c.

Revert "Remove TARGET_HAS_OLD_QCOM_ION"

This reverts commit 3734349bb67485709d1e5d7d595a789e93bcedd6.

Change-Id: I91006f6c6960a7ee819e5070b466e62f41f3b32d