bluetooth: host: Persist Service Changed data

Add support for persisted Service Changed data, to fix the case of a paired device not reconnecting before a reboot and thus not receiving SC indication. It also enables support for GATT database being changed during a firmware update. Move Service Changed data outside of the CCC struct and make it persistent by adding support for a bt/sc/... setting. Signed-off-by: François Delawarde <fnde@oticon.com>

Author: fnde-ot

include/bluetooth/gatt.h

@@ -563,7 +563,6 @@ struct bt_gatt_ccc_cfg {
 u8_t id;
 bt_addr_le_tpeer;
 u16_tvalue;
-u8_tdata[4] __aligned(4);
 };
 
 /* Internal representation of CCC value */