Bluetooth: Move bt_data_parse to dedicated source file

This moves bt_data_parse function outside of hci_core.c.
Having it in separate file makes unit testing easier as the
function do not use kernel objects, thus can be used in unit tests
without a need for adding any mocks.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>

subsys/bluetooth/host/CMakeLists.txt

@@ -34,6 +34,7 @@ if(CONFIG_BT_HCI_HOST)
     uuid.c
     addr.c
     buf.c
+    data.c
     hci_core.c
     hci_common.c
     id.c