platform/x86/intel/ifs: Reorganize driver data

The struct holding device driver data contained both read only(ro)
and read write(rw) fields.

Separating ro fields from rw fields was recommended as
a preferable design pattern during review[1].

Group ro fields into a separate const struct. Associate it to
the miscdevice being registered by keeping its pointer in the
same container struct as the miscdevice.

Link: https://lore.kernel.org/lkml/[email protected]/ [1]

Signed-off-by: Jithu Joseph <[email protected]>
Reviewed-by: Tony Luck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>

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