arm: dts: kirkwood: Remove DTS files for Kirkwood boards

Remove DTS and DTSI files for Kirkwood boards that have upstream supports.

This patch depends on
"arm: dts: kirkwood: Enable upstream DT on Kirkwood boards"
https://patchwork.ozlabs.org/project/uboot/patch/20240322021747.14873-1-mibodhi@gmail.com/

Signed-off-by: Tony Dinh <mibodhi@gmail.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
40 files changed