io-mapping: Fixup for different names of writecombine

Somehow architectures can't agree on this. And for good measure make
sure we have a fallback which should work everywhere (fingers
crossed).

v2: Make it compile properly, needs a defined() for the #elif.

Fixes: ac96b556 ("io-mapping.h: s/PAGE_KERNEL_IO/PAGE_KERNEL/")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: linux-mm@kvack.org
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160823202233.4681-1-daniel.vetter@ffwll.ch
(cherry picked from commit 80c33624)

include/linux/io-mapping.h

@@ -123,7 +123,13 @@ io_mapping_init_wc(struct io_mapping *iomap,
 	iomap->base = base;
 	iomap->size = size;
 	iomap->iomem = ioremap_wc(base, size);
+#if defined(pgprot_noncached_wc) /* archs can't agree on a name ... */
+	iomap->prot = pgprot_noncached_wc(PAGE_KERNEL);
+#elif defined(pgprot_writecombine)
 	iomap->prot = pgprot_writecombine(PAGE_KERNEL);
+#else
+	iomap->prot = pgprot_noncached(PAGE_KERNEL);
+#endif
 
 	return iomap;
 }