[SPARC64]: Use DECLARE_BITMAP in struct pci_iommu.

	/* CTX allocation. */

	unsigned long ctx_lowest_free;

	unsigned long ctx_bitmap[IOMMU_NUM_CTXS / (sizeof(unsigned long) * 8)];

	DECLARE_BITMAP(ctx_bitmap, IOMMU_NUM_CTXS);

	/* Here a PCI controller driver describes the areas of

	 * PCI memory space where DMA to/from physical memory