imx8m*_venice: move venice to OF_UPSTREAM

Move to imx8m{m,n,p}-venice to OF_UPSTREAM:
 - replace the non-upstream generic imx8m{m,n,p}-venice dt with one of the
   dt's from the OF_LIST
 - handle the fact that dtbs now have a 'freescale/' prefix
 - imply OF_UPSTREAM
 - remove rudundant files from arch/arm/dts leaving only the
   *-u-boot.dtsi files

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
diff --git a/configs/imx8mp_venice_defconfig b/configs/imx8mp_venice_defconfig
index ecb08ca..501ccb0 100644
--- a/configs/imx8mp_venice_defconfig
+++ b/configs/imx8mp_venice_defconfig
@@ -8,7 +8,7 @@
 CONFIG_ENV_SIZE=0x8000
 CONFIG_ENV_OFFSET=0x3f0000
 CONFIG_DM_GPIO=y
-CONFIG_DEFAULT_DEVICE_TREE="imx8mp-venice"
+CONFIG_DEFAULT_DEVICE_TREE="freescale/imx8mp-venice-gw71xx-2x"
 CONFIG_SPL_TEXT_BASE=0x920000
 CONFIG_TARGET_IMX8MP_VENICE=y
 CONFIG_OF_LIBFDT_OVERLAY=y
@@ -75,7 +75,7 @@
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
-CONFIG_OF_LIST="imx8mp-venice imx8mp-venice-gw71xx-2x imx8mp-venice-gw72xx-2x imx8mp-venice-gw73xx-2x imx8mp-venice-gw74xx imx8mp-venice-gw7905-2x"
+CONFIG_OF_LIST="freescale/imx8mp-venice-gw71xx-2x freescale/imx8mp-venice-gw72xx-2x freescale/imx8mp-venice-gw73xx-2x freescale/imx8mp-venice-gw74xx freescale/imx8mp-venice-gw7905-2x"
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
 CONFIG_SYS_MMC_ENV_DEV=2