binder: introduce the BINDER_GET_FROZEN_INFO ioctl

User space needs to know if binder transactions occurred to frozen
processes. Introduce a new BINDER_GET_FROZEN ioctl and keep track of
transactions occurring to frozen proceses. Also, allow async
transactions toward frozen processes and improve error hendling.

Bug: 143717177
Test: atest testBinderLib
Signed-off-by: Marco Ballesio <balejs@google.com>

Change-Id: I9ee1c2e5fe3d4ab31fc1a137d840bd4cd38a8704