wandboard: Switch to SPL support

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

By switching to SPL we can support all these variants with a single binary,
which is very convenient.

Based on the work from Richard Hu.

Tested kernel booting on the three boards.

Signed-off-by: Richard Hu <hakahu@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Vagrant Cascadian <vagrant@aikidev.net>
Reviewed-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/wandboard/Makefile b/board/wandboard/Makefile
index 5b50eca..db9f4a6 100644
--- a/board/wandboard/Makefile
+++ b/board/wandboard/Makefile
@@ -4,4 +4,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y  := wandboard.o
+obj-y  := wandboard.o spl.o