The problem is that when loading next IDE PCI module memory used by
previously registered ide_pci_host_proc_list entry is already unmapped
(because of __{dev}initdata).  This doesn't happen in built-in case
because this memory is freed after all drivers are initialized.
Fix it by removing __{dev}initdata from all ide_pci_host_proc_t.

Thanks to Andre Tomt <andre@tomt.net> for help in debugging this.