treewide: remove label = "cpu" from DSA dt-binding
This is not used by the DSA dt-binding, so remove it from all devicetrees.
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9cc115d8d6f73dd260de1609182f3645844d6907
Signed-off-by: Arınç ÜNAL <[email protected]>