ipu-v3: Include <linux/io.h>

The code uses readl() and writel(). Include the header file to
get the declarations.

Signed-off-by: Thomas Zimmermann <[e-mail]>
Reviewed-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Sam Ravnborg <[e-mail]>
Reviewed-by: Sui Jingfeng <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/ipu-v3/ipu-prv.h

···
 
 struct ipu_soc;
 
+#include <linux/io.h>
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/clk.h>