ANDROID: GKI: Add commonly used symbols for hikey build

7 Added functions:
  # commonly used symbols
  [A] 'function sk_buff* __hci_cmd_sync(hci_dev*, u16, u32, void*, u32)'
  [A] 'function void bt_procfs_cleanup(net*, const char*)'
  [A] 'function int bt_procfs_init(net*, const char*, bt_sock_list*, int (seq_file*, void*)*)'
  [A] 'function void bt_sock_link(bt_sock_list*, sock*)'
  [A] 'function int bt_sock_register(int, const net_proto_family*)'
  [A] 'function void bt_sock_unlink(bt_sock_list*, sock*)'
  [A] 'function void bt_sock_unregister(int)'

Bug: 364687936
Change-Id: Ib448adb4e0cc78213dcead2414fd25b215bd24fe
Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>