Use local copy of vm_sockets.h on non-Trusty for portability

This uses binder's copy of the vm_sockets.h header for the definition of
vsock types and constants. This header is more portable as it works on
non-bionic based Linux systems and non-Linux systems that use compatible
types and constants.

Change-Id: I95171de08726754578ba00b4fb19524b9140afdb