arm64: dts: broadcom: northstar2: Rework clock nodes

arm64: dts: broadcom: northstar2: Rework clock nodes

The nd2-clocks.dtsi is oddly included in the middle of a bus node and is
only included in one place, so collapse it into ns2.dtsi. Move the fixed
and fixed-factor clock nodes to the root as they are not part of the
bus. Rename the node names to use preferred names.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20260106-dt-dtbs-broadcom-fixes-v1-10-ba45874e4553@kernel.org
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>