Fix usage of Ficr::address

This is following a rebase on top of
#2074, which now uses `address()`
rather than `full_address()` for retrieving the device address.

chips/nrf52/src/ble_radio.rs

@@ -818,7 +818,7 @@ impl<'a> rubble::RubbleDataDriver<'a> for Radio<'a> {
         // accessors of FICR also only use read-only access.
         let (raw_address, address_type) = unsafe {
             let ficr = &FICR_INSTANCE;
-            (ficr.full_address(), ficr.address_type())
+            (ficr.address(), ficr.address_type())
         };
 
         rubble::DeviceAddress {