Revert "vm_sockets: Add flags field in the vsock address data structure"

This reverts commit 40e6fbd0 which is
commit dc8eeef7 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: I5f154d17cb4818466588029d6e5d8e6a8e5b1c25
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>