gpu: ion: Add support for heap walking

Clients may wish to implement custom functions on a particular
heap ID. Add a generic interface to walk all the heaps available
and call a function on the particular heap ID.

Change-Id: I8b3de7a2de74cd9ea1873020ed00ee40100ce923
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
2 files changed