Adding the label cpu0 allows the adjustment of cpu-parameters
by reference in overlaying dtsi files in the same way as it
is possible for imx6q devices.
Signed-off-by: Jan Tuerk <jan.tuerk@emtrion.com> Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org>