ide: mark special "ide0=" kernel parameters as obsoleted

Mark "ide0=ali14xx|cmd640_vlb|dtc2278|ht6560b|qd65xx|umc8672" kernel
parameters as obsoleted (per host driver replacements have been available
for a long time).

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