media: rc: add missing io.h

In many remote control drivers the io.h is implied by others.  This is not
good as it prevents from cleanups done in other headers.  Add missing
include.

drivers/media/rc/mtk-cir.c

@@ -8,6 +8,7 @@
 #include <linux/clk.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
+#include <linux/io.h>
 #include <linux/of_platform.h>
 #include <linux/reset.h>
 #include <media/rc-core.h>

drivers/media/rc/serial_ir.c

@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/interrupt.h>
+#include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/serial_reg.h>
 #include <linux/types.h>

drivers/media/rc/st_rc.c

@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/clk.h>
 #include <linux/interrupt.h>
+#include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>

drivers/media/rc/sunxi-cir.c

@@ -12,6 +12,7 @@
 
 #include <linux/clk.h>
 #include <linux/interrupt.h>
+#include <linux/io.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/reset.h>