sun7i: Add bananapi board

The Banana Pi is an A20 based development board using Raspberry Pi compatible
IO headers. It comes with 1 GB RAM, 1 Gb ethernet, 2x USB host, sata, hdmi
and stereo audio out + various expansion headers:

http://www.lemaker.org/

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/configs/Bananapi_defconfig b/configs/Bananapi_defconfig
new file mode 100644
index 0000000..be3d815
--- /dev/null
+++ b/configs/Bananapi_defconfig
@@ -0,0 +1,4 @@
+CONFIG_SPL=y
+CONFIG_SYS_EXTRA_OPTIONS="BANANAPI,SPL,AXP209_POWER,SUNXI_GMAC,RGMII,MACPWR=SUNXI_GPH(23),AHCI,USB_EHCI"
++S:CONFIG_ARM=y
++S:CONFIG_TARGET_SUN7I=y