imx6-tqma6: Convert to OF_UPSTREAM

Instead of using the local imx6-tqma6 devicetree copies from U-Boot,
convert the imx6-tqma6 target to OF_UPSTREAM so that the upstream
kernel devicetrees can be used instead.

Signed-off-by: Fabio Estevam <festevam@denx.de>
diff --git a/board/tq/tqma6/Kconfig b/board/tq/tqma6/Kconfig
index e7f2336..b42c8e2 100644
--- a/board/tq/tqma6/Kconfig
+++ b/board/tq/tqma6/Kconfig
@@ -72,6 +72,7 @@
 	select PHY_MICREL
 	select PHY_MICREL_KSZ90X1
 	select MXC_UART
+	imply OF_UPSTREAM
 	help
 	  Select the MBa6 starterkit. This features a GigE Phy, USB, SD-Card
 	  etc.