[nrf fromtree] Bluetooth: Host: Remove code causing build error

This code is redundant and causes a build error if called more than
once.

Signed-off-by: Timothy Keys <[email protected]>
(cherry picked from commit 97399d4)

Signed-off-by: Sean Madigan <[email protected]>

Author: weeTike

tests/bluetooth/host/cs/mocks/hci_core.c

@@ -9,11 +9,5 @@
 #include <zephyr/bluetooth/hci.h>
 #include <zephyr/kernel.h>
 
-#include <host/hci_core.h>
-
-struct bt_dev bt_dev = {
-	.manufacturer = 0x1234,
-};
-
 DEFINE_FAKE_VALUE_FUNC(struct net_buf *, bt_hci_cmd_create, uint16_t, uint8_t);
 DEFINE_FAKE_VALUE_FUNC(int, bt_hci_cmd_send_sync, uint16_t, struct net_buf *, struct net_buf **);