ide: fix <asm-xtensa/ide.h>

* Add missing <asm-generic/ide_iops.h> include.

While at it:

* Remove needless ide_default_{irq,io_base}() inlines.

Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>