nitrogen6x: config: enable Android fastboot

Enable 'fastboot' command.

This is currently enabled but not yet functional. Including it in the
configuration will ease further testing and development as discussed
on the mailing list.
Signed-off-by: NEric Nelson <eric.nelson@boundarydevices.com>

include/configs/nitrogen6x.h

@@ -413,4 +413,9 @@
 #define CONFIG_G_DNL_PRODUCT_NUM 0xa4a5
 #define CONFIG_G_DNL_MANUFACTURER "Boundary"
 
+#define CONFIG_CMD_FASTBOOT
+#define CONFIG_ANDROID_BOOT_IMAGE
+#define CONFIG_USB_FASTBOOT_BUF_ADDR   CONFIG_SYS_LOAD_ADDR
+#define CONFIG_USB_FASTBOOT_BUF_SIZE   0x07000000
+
 #endif	       /* __CONFIG_H */