display: Use ion cookie in GPU Tonemapper
- The fd's used for book-keeping can change when the clients
close and reopen sessions, hence they are not reliable and
can lead to incorrect virtual address usage causing
corruption or stale data.
- Hence use ion cookie for book-keeping which is unique for a
given memory fd.
- Use LRU method free up/reuse on reaching max limit.
- Remove Tonemapper_destroy which is not needed anymore.
Change-Id: I5777649b34210977c18ce20c65e0aa2baa8e7d26
Crs-fixed: 1110175
7 files changed
