Fix typo in chosen parameter in vf610-twr.dts

Fix typo "choosen" instead of "chosen" in vf610-twr.dts.
Fixes boot process and terminal output for Vybrid series.

Signed-off-by: Alexander Merkle <alexander.merkle@lauterbach.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>