gpu: ion: Add support for content protection 2.0 in CP heap

Add support to allow ion_cp_heap.c to secure according to new
requirements. This includes adding versioning to the secure
calls to allow other types of securing to take place.

Change-Id: I65e07ebaeefa1d0572b6531753a707a28284aa0d
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>