Revert "af_vsock: Assign the vsock transport considering the vsock address flags"

This reverts commit 833da12e which is
commit 7f816984 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I5a08f3e2c9aba528cfe05df1f5c3b24f059955dd
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>