lib/uuid: Fix bt_uuid_strcmp
lib/uuid: Fix bt_uuid_strcmp

bt_uuid_strcmp shall first convert the strings to bt_uuid_t using
bt_string_to_uuid since bt_uuid_to_string can produce different formats
depending on the type.

pkarasev3/bluez,pkarasev3/bluez,pkarasev3/bluez,pkarasev3/bluez