Use hidl memory from allocator in CAS

Mpeg2ts extractor has a depedency on libbinder for
IMemory, but it doesn't actually use IMemory other
than using it to construct the hidl memory.

Make mediaextractor use hidl memory allocated by
hidl allocator, instead of constructing hidl memory
from IMemory.

bug: 112766913
bug: 111407253
test: CTS MediaDrmClearkeyTest#testClearKeyPlaybackMpeg2ts

Change-Id: I39e131718ea41f9cb23177c28213ddf7b7741338