Support multiple codecs per crypto instance

The initial drm hidl hal implementation assumed one
codec per crypto instance, but in fact there can be
multiple codecs per crypto instance. This change
extends the drm hal to allow multiple memory heaps
per crypto plugin. It fixes the issue of mapping
memory frequently during playback.

bug:35275191

Test: manual verification with Play Movies on angler
in passthrough mode and on marlin in binderized mode.

Change-Id: Icada005f515483d7bc214b08caf6eea46ca354a7