ANDROID: binder: Add strong ref checks

Prevent using a binder_ref with only weak references where a strong
reference is required.

BUG: 30445380

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Git-repo: https://android.googlesource.com/kernel/msm.git


Git-commit: 5e2a2bc89956ae1c739854403408059144b23c28
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>
Change-Id: I66c15b066808f28bd27bfe50fd0e03ff45a09fca
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>