scripts: sunxi: Build an raw SPL image

Introduce a new sunxi-spl-with-ecc.bin image with already the right header,
ECC, randomizer and padding for the BROM to be able to read it.

It needs to be flashed using a raw access to the NAND so that the
controller doesn't change a thing to it, since we already have all the
right parameters.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/Makefile b/Makefile
index 2638acf..ca7d60d 100644
--- a/Makefile
+++ b/Makefile
@@ -1345,6 +1345,9 @@
 spl/sunxi-spl.bin: spl/u-boot-spl
 	@:
 
+spl/sunxi-spl-with-ecc.bin: spl/sunxi-spl.bin
+	@:
+
 spl/u-boot-spl.sfp: spl/u-boot-spl
 	@: