Re-organize handling of quirky devices:

* Add struct cd_list_entry, ide_cd_quirks_list[] and ide_cd_flags() helper.

* Set flags returned by ide_cd_flags() in ide_cdrom_setup().

* Add IDE_CD_FLAG_VERTOS_{300_SDD,600_ESD} and IDE_CD_FLAG_SANYO_3CD flags.

* Move device quirks from ide_cdrom_setup() to ide_cd_quirks_list[].

* Rename IDE_CD_FLAG_NEC260 to IDE_CD_FLAG_PRE_ATAPI12 and handle
  quirky Stingray 8X CD-ROM using ide_cd_quirks_list[].

* Add IDE_CD_FLAG_FULL_CAPS_PAGE flag and handle quirky ACER 50X CD-ROM
  / WPI 32X CD-ROM using ide_cd_quirk_list[].

* Add IDE_CD_FLAG_PLAY_AUDIO_OK flag and handle quirky MATSHITA DVD-ROMs
  using ide_cd_quirks_list[].

* Add IDE_CD_FLAG_LE_SPEED_FIELDS flag and handle quirky ACER/AOpen 24X
  CD-ROM using ide_cd_quirk_list[].

* Fix some comments about quirky devices while at it.

There should be no functionality changes caused by this patch.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>