Consolidate ion usage functions and bring all ion related
usage into one single function. This helps to easily
write a different allocation wrapper in case a new allocator
need to be used in future.
CRs-Fixed: 2852327
Change-Id: I717ee5a976ae0f148dcdd5a050204514566c823d
Signed-off-by: Pavan Kumar Chilamkurthi <pchilamk@codeaurora.org>