gpio: pl061: Add missing header(s)

Do not imply that some of the generic headers may be always included.
Instead, include explicitly what we are direct user of.

While at it, sort headers alphabetically.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/gpio/gpio-pl061.c

@@ -8,22 +8,23 @@
  *
  * Data sheet: ARM DDI 0190B, September 2000
  */
-#include <linux/spinlock.h>
+#include <linux/amba/bus.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
 #include <linux/errno.h>
+#include <linux/gpio/driver.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
-#include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/module.h>
-#include <linux/bitops.h>
-#include <linux/gpio/driver.h>
-#include <linux/device.h>
-#include <linux/amba/bus.h>
-#include <linux/slab.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/pm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
 
 #define GPIODIR 0x400
 #define GPIOIS  0x404