[PATCH] net/macb: add proper header file

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

mips allmodconfig build fails with the error:

drivers/net/ethernet/cadence/macb.c: In function 'macb_probe':
drivers/net/ethernet/cadence/macb.c:2908:2: error: implicit declaration of function 'devm_gpiod_get_optional' [-Werror=implicit-function-declaration]
  bp->reset_gpio = devm_gpiod_get_optional(&bp->pdev->dev, "phy-reset",
  ^
drivers/net/ethernet/cadence/macb.c:2909:8: error: 'GPIOD_OUT_HIGH' undeclared (first use in this function)
        GPIOD_OUT_HIGH);
        ^
drivers/net/ethernet/cadence/macb.c:2909:8: note: each undeclared identifier is reported only once for each function it appears in
drivers/net/ethernet/cadence/macb.c: In function 'macb_remove':
drivers/net/ethernet/cadence/macb.c:2979:3: error: implicit declaration of function 'gpiod_set_value' [-Werror=implicit-function-declaration]
   gpiod_set_value(bp->reset_gpio, 0);
   ^

Add the proper header file to resolve it.  

Fixes: 5833e0526820 ("net/macb: add support for resetting PHY using GPIO")
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---

build log with next-20151217 is at:
https://travis-ci.org/sudipm-mukherjee/parport/jobs/97388463

 drivers/net/ethernet/cadence/macb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 0123646..988ee14 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -19,6 +19,7 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
-- 
1.9.1