Bluetooth: HCI: Re-organize vendor read static address handling

Add header definition for bt_read_static_addr function. Declaring it
without a header definition will not give any compilation error when
function definition changes.
Refactor nRF SoC specific code into nRF specific source files and
provide weak definitions when these are not implemented. This will make
it easier to add handlers per vendor.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>

include/bluetooth/addr.h

@@ -10,6 +10,7 @@
 #ifndef ZEPHYR_INCLUDE_BLUETOOTH_ADDR_H_
 #define ZEPHYR_INCLUDE_BLUETOOTH_ADDR_H_
 
+#include <string.h>
 #include <zephyr/types.h>
 
 #ifdef __cplusplus

include/drivers/bluetooth/hci_driver.h

@@ -20,6 +20,7 @@
 #include <stdbool.h>
 #include <net/buf.h>
 #include <bluetooth/buf.h>
+#include <bluetooth/hci_vs.h>
 #include <device.h>
 
 #ifdef __cplusplus
@@ -95,6 +96,15 @@ int bt_recv(struct net_buf *buf);
  */
 int bt_recv_prio(struct net_buf *buf);
 
+/** @brief Read static addresses from the controller.
+ *
+ *  @param addrs  Random static address and Identity Root (IR) array.
+ *  @param size   Size of array.
+ *
+ *  @return Number of addresses read.
+ */
+u8_t bt_read_static_addr(struct bt_hci_vs_static_addr addrs[], u8_t size);
+
 /** Possible values for the 'bus' member of the bt_hci_driver struct */
 enum bt_hci_driver_bus {
 	BT_HCI_DRIVER_BUS_VIRTUAL       = 0,