Revert "RPC Binder: dropping all binders drops session"

This reverts commit 75047ca4df8f6d88e16f131b2a8d54bfa013c2e6.

Reason for revert: See b/273486801. Build broken: branch git_master, target aosp_arm64-userdebug_tidy.

Change-Id: I79c9b003299b159dfdad18d70a5677e03e7da130
9 files changed