dt-bindings: define little-endian property for QorIQ GPIO

The GPIO block on different QorIQ chips could have registers in different
endianess.  Define the property to specify which endian is used by the
hardware.
Signed-off-by: NLiu Gang <Gang.Liu@freescale.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NLi Yang <leoli@freescale.com>
Signed-off-by: NKevin Hilman <khilman@linaro.org>

Documentation/devicetree/bindings/gpio/gpio-mpc8xxx.txt

@@ -11,6 +11,10 @@ Required properties:
       0 = active high
       1 = active low
 
+Optional properties:
+- little-endian : GPIO registers are used as little endian. If not
+                  present registers are used as big endian by default.
+
 Example:
 
 gpio0: gpio@1100 {