udoo: Switch to SPL support

Currently we need to build one U-boot image for each of the udoo
variants: quad and dual-lite.

By switching to SPL we can support all two variants with a single binary.

Based on the SPL for wandboard.

Tested with OpenELEC (Open Embedded Linux Entertainment Center)
on both boards.

Signed-off-by: Peter Vicman <peter.vicman@gmail.com>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Peter Vicman <peter.vicman@gmail.com>
Acked-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/board/udoo/MAINTAINERS b/board/udoo/MAINTAINERS
index ee8b61e..789e98f 100644
--- a/board/udoo/MAINTAINERS
+++ b/board/udoo/MAINTAINERS
@@ -3,4 +3,4 @@
 S:	Maintained
 F:	board/udoo/
 F:	include/configs/udoo.h
-F:	configs/udoo_quad_defconfig
+F:	configs/udoo_defconfig