Add getBinderKernelReferences

Add a wrapper for the new BINDER_GET_NODE_DEBUG_INFO ioctl for use by
libmemunreachable.

Test: memunreachable_binder_test
Bug: 28275695
Change-Id: Ic112584fa05071bd336974b3a18869077a69389b
Merged-In: Ic112584fa05071bd336974b3a18869077a69389b
(cherry picked from commit b869cc94)