bus: bt1-apb: Include linux/io.h

It must be included since we are using readl() method here.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Serge Semin <[email protected]>
Cc: Alexey Malahov <[email protected]>
Cc: Olof Johansson <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: [email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Author: fancer

drivers/bus/bt1-apb.c

@@ -15,6 +15,7 @@
 #include <linux/atomic.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
+#include <linux/io.h>
 #include <linux/nmi.h>
 #include <linux/of.h>
 #include <linux/regmap.h>