sunxi: add support for UART2 on A23/A33

Add support for UART2 (2-pin version but note that RTS/CTS pins are available
pn that port for possible future use), can be selected in config
by using CONFIG_CONS_INDEX=3

Signed-off-by: Laurent Itti <laurentitti@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
index 59d8210..148123a 100644
--- a/arch/arm/include/asm/arch-sunxi/gpio.h
+++ b/arch/arm/include/asm/arch-sunxi/gpio.h
@@ -155,6 +155,7 @@
 #define SUN5I_GPB_TWI2		2
 #define SUN4I_GPB_UART0		2
 #define SUN5I_GPB_UART0		2
+#define SUN8I_GPB_UART2		2
 
 #define SUNXI_GPC_SDC2		3
 #define SUN6I_GPC_SDC3		4