arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead

Preparation for uniform definition of ioremap, ioremap_wc, ioremap_wt,
and ioremap_cache, tree-wide.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/mtd/devices/slram.c

@@ -41,7 +41,7 @@
 #include <linux/fs.h>
 #include <linux/ioctl.h>
 #include <linux/init.h>
-#include <asm/io.h>
+#include <linux/io.h>
 
 #include <linux/mtd/mtd.h>