GPIO: Correct doc typo "confguration" -> "configuration"

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
diff --git a/drivers/gpio/db8500_gpio.c b/drivers/gpio/db8500_gpio.c
index db32db6..eefb56d 100644
--- a/drivers/gpio/db8500_gpio.c
+++ b/drivers/gpio/db8500_gpio.c
@@ -174,7 +174,7 @@
 
 /**
  * config_pin - configure a pin's mux attributes
- * @cfg: pin confguration
+ * @cfg: pin configuration
  *
  * Configures a pin's mode (alternate function or GPIO), its pull up status,
  * and its sleep mode based on the specified configuration.  The @cfg is