memory: omap-gpmc: Get the header of the enum

Commit 21abf10
("gpio: Pass a flag to gpiochip_request_own_desc()")
started to pass an enum gpiod_flags but this file is
not including the header file that defines that enum
and the compiler spits:

drivers/memory/omap-gpmc.c: In function
			    'gpmc_probe_generic_child':
drivers/memory/omap-gpmc.c:2174:9: error: type of formal
				   parameter 4 is incomplete
         0);
         ^

Cc: Ladislav Michl <[email protected]>
Cc: Janusz Krzysztofik <[email protected]>
Reported-by: Stephen Rothwell <[email protected]>
Fixes: 21abf10 ("gpio: Pass a flag to gpiochip_request_own_desc()")
Acked-by: Tony Lindgren <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

drivers/memory/omap-gpmc.c

@@ -21,6 +21,7 @@
 #include <linux/spinlock.h>
 #include <linux/io.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h> /* GPIO descriptor enum */
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/platform_device.h>