infect: Remove parasite-syscall.h from infect

This is

* Move parasite_setup_regs() and related into arch/infect
* Move arch_can_dump_task() into infect
* Move parasite_send_fd() into infect-util

and completes parasite-syscall.h removal.

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>