sunxi: Add mmc card-detect functionality

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index 318f526..5f54c01 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -181,6 +181,7 @@
 
 /* GPIO */
 #define CONFIG_SUNXI_GPIO
+#define CONFIG_SPL_GPIO_SUPPORT
 #define CONFIG_CMD_GPIO
 
 /* Ethernet support */