dts/smartbond: Move bt_hci_da1469x node outside of soc node

Move bt_hci_da1469x node outside of soc node to fix warning:

"Warning (simple_bus_reg): /soc/bt_hci_da1469x: missing or
empty reg/ranges property"

Signed-off-by: Ioannis Damigos <ioannis.damigos.uj@renesas.com>