dl2k endianness fixes (.24 fodder?)

* shift before cpu_to_le64(), not after it
* writel() converts to l-e itself
* misc missing conversions
* in set_multicast() hash_table[] is host-endian; we feed it to card
  via writel() and populate it as host-endian, so we'd better put the
  first element into it also in host-endian
* pci_unmap_single() et.al. expect host-endian, not little-endian

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>