misc generic ide stuff

Hi Bart,

here are some generic ide conversion patches. The first 12 are what i thought
you suggested :) concerning prepping the ide-cd code for the generic layer. The
remaining 6 are what i've done so far wrt removing ide_atapi_pc from the ide
drivers. It is obvious that this is not trivial and I basically tiptoe around the
landmines in the IRQ handler and request issue paths :). This raises also
several questions:

1. ide-cd uses the cdrom_info struct for e.g. dma status notification, the other
ide drivers use it per packet command in pc->flags. Well the last are kinda too
much to carry for _each_ command and i'm thinking maybe put all that in the
ide_drive_t and make it generic enough to fit all drivers. This way
pc->callback() can also be harboured there. One concern might be when a flag is
strictly per packet command which could be put somewhere else (maybe in the
struct request since it already has members when it is used as a packet
command).

2. Can all that pc->xferred, pc->b_count, pc->errors and pc->cur_pos accounting
be safely mapped to a rq? I see some discrepancies like is pc->buf_size ==
rq->data_len, what about pc->req_xfer? I'll have a more detailed look at those
when i have more spare time later.

3. (I'm sure there are more :))
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