[PATCH] platform/chrome: add missing include in cros_ec_lpc driver

[Arnd Bergmann <arnd@arndb.de>]

The newly added cros_ec_lpc driver is meant for x86 but can
also be built on other architectures. However, the original
version causes a compile error when built on ARM because
of a missing #include:

drivers/platform/chrome/cros_ec_lpc.c: In function 'ec_response_timed_out':
drivers/platform/chrome/cros_ec_lpc.c:40:3: error: implicit declaration of function 'inb' [-Werror=implicit-function-declaration]
   if (!(inb(EC_LPC_ADDR_HOST_CMD) & EC_LPC_STATUS_BUSY_MASK))
   ^

This includes linux/io.h to make it compile reliably.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: ec2f33ab582bf ("platform/chrome: Add cros_ec_lpc driver for x86 devices")
Cc: Bill Richardson <wfrichar@chromium.org>
Cc: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Olof Johansson <olof@lixom.net>

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 822fdb36ded9..f00bf4d246a1 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -23,6 +23,7 @@
 
 #include <linux/dmi.h>
 #include <linux/delay.h>
+#include <linux/io.h>
 #include <linux/mfd/cros_ec.h>
 #include <linux/mfd/cros_ec_commands.h>
 #include <linux/module.h>