i2c: jz4780: Explicitly include linux/io.h

This driver uses readw() and writew() which are declared in asm/io.h but does not explicitly include that header, causing build failures on architectures where there is not an implicit inclusion such as arm and arm64:

../drivers/i2c/busses/i2c-jz4780.c:181:2: error: implicit declaration of function 'readw' [-Werror=implicit-function-declaration] ../drivers/i2c/busses/i2c-jz4780.c:187:2: error: implicit declaration of function 'writew' [-Werror=implicit-function-declaration]

Add an explicit inclusion to fix this.

---
 drivers/i2c/busses/i2c-jz4780.c | 1 +
 1 file changed, 1 insertion(+)

index ce1d69324169..19b2d689a5ef 100644
@@ -23,6 +23,7 @@
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>

2.1.4

Thanks, I just pushed the same fix from Guenter Roeck to -next.