mx6qsabreauto: Add SPL support

Add support for mx6q, mx6dl and mx6qp sabreauto boards in SPL.

Retrieved the mx6q DCD table from:
board/freescale/mx6qsabreauto/imximage.cfg

Retrieved the mx6dl DCD table from:
board/freescale/mx6qsabreauto/mx6dl.cfg

Retrieved the mx6qp DCD table from:
board/freescale/mx6qsabreauto/mx6qp.cfg

Flashed SPL and u-boot.img to an SD card and could successfully boot it
on mx6q, mx6qp and mx6dl sabreauto boards.

Signed-off-by: Vanessa Maegima <vanessa.maegima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/cpu/armv7/mx6/Kconfig b/arch/arm/cpu/armv7/mx6/Kconfig
index 1e5dc9a..599057e 100644
--- a/arch/arm/cpu/armv7/mx6/Kconfig
+++ b/arch/arm/cpu/armv7/mx6/Kconfig
@@ -208,6 +208,7 @@
 config TARGET_MX6QSABREAUTO
 	bool "mx6qsabreauto"
 	select BOARD_LATE_INIT
+	select SUPPORT_SPL
 	select DM
 	select DM_THERMAL
 	select BOARD_EARLY_INIT_F