ide-cs: manage I/O resources in driver

* Make idecs_register() return pointer to hwif structure instead of
  hwif's index.

* Store pointer to hwif structure instead of hwif's index in ide_info_t
  (fixes ide-cs for IDE[6-9]_MAJOR major numbers).

* Remove no longer needed ide_major[].

* Tell IDE layer to not manage resources by setting hwif->mmio flag.

* Use {request,release}_region() for resources management.

* Use driver name for resources management.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>