dts: bluetooth: add base binding for BLE radio hardware capabilities

Create a shared base binding (ble-radio.yaml) for common Bluetooth LE
radio hardware capabilities to avoid duplication between vendors and
ensure consistent property naming across the ecosystem.

Properties are prefixed with 'ble-' and ordered chronologically by
Bluetooth Core Specification version (5.0, 5.1, 6.0). Each property
indicates a hardware capability, not current enablement state.

Signed-off-by: Ivan Pankratov <ivan.pankratov@silabs.com>