Revert "FROMLIST: android: binder: Drop lru lock in isolate callback"

This reverts commit 472975aa as it
breaks the build.

Cc: Kyle Yan <kyan@codeaurora.org>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Sherry Yang <sherryy@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>