ARM: dts: imxrt1050: Migrate to OF_UPSTREAM

The device tree for imxrt1050 is now
available in the /dts/upstream directory.
Migrate board to use OF_UPSTREAM.

Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
6 files changed