mmc: meson-gx-mmc: Explicitly include pinctr/consumer.h

The Meson GX MMC driver fails to build after commit 23c35f48
("pinctrl: remove include file from <linux/device.h>") because it relies
on the pinctrl/consumer.h being pulled in by the device.h header
implicitly.

Include the header explicitly to avoid the build failure.

Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/mmc/host/meson-gx-mmc.c

@@ -37,6 +37,7 @@
 #include <linux/regulator/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/bitfield.h>
+#include <linux/pinctrl/consumer.h>
 
 #define DRIVER_NAME "meson-gx-mmc"