binder tests respect libbinder bitness

Some 32-bit kernels use a binder kernel interface with a different API
controlled by the kernel configuration CONFIG_ANDROID_BINDER_IPC_32BIT.
This changes builds versions of these tests built for this bitness
specially so that they can run and work on these devices.

Test: atest --all binderLibTest{,_IPC_32} binderDriverInterfaceTest{,_IPC_32}
Bug: 154755898

Change-Id: I82b47e8064564a037bf8ed453e9ae7b8901b5667