Break cyclic binder dependency

Break a cyclic binder dependency by having media.extractor perform
datasource->close() on a separate thread.

Bug: 199822700
Test: Boot, populate device
Test: OEM verified against their tests / reproduction cases
(cherry picked from https://android-review.googlesource.com/q/commit:b3d329c201b7be3fdbaac54d59cc2d626fe54b82)
Merged-In: I981b9230589677cc559af4cc89c1e3643ea215f7
Change-Id: I981b9230589677cc559af4cc89c1e3643ea215f7