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/configs/tqma6q_mba6_spi_defconfig b/configs/tqma6q_mba6_spi_defconfig
index a7ffc9e..28b1bfc 100644
--- a/configs/tqma6q_mba6_spi_defconfig
+++ b/configs/tqma6q_mba6_spi_defconfig
@@ -9,7 +9,7 @@
 CONFIG_MX6Q=y
 CONFIG_TARGET_TQMA6=y
 CONFIG_TQMA6X_SPI_BOOT=y
-CONFIG_DEFAULT_DEVICE_TREE="imx6q-mba6b"
+CONFIG_DEFAULT_DEVICE_TREE="nxp/imx/imx6q-mba6b"
 CONFIG_ENV_OFFSET_REDUND=0x90000
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
@@ -18,7 +18,7 @@
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_USE_BOOTCOMMAND=y
 CONFIG_BOOTCOMMAND="sf probe; run mmcboot; run netboot; run panicboot"
-CONFIG_DEFAULT_FDT_FILE="imx6q-mba6x.dtb"
+CONFIG_DEFAULT_FDT_FILE="nxp/imx/imx6q-mba6x.dtb"
 CONFIG_SYS_PBSIZE=532
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_MAXARGS=32