Remove licenses of submodules

Author: DemesneGH

LICENSE

@@ -200,24 +200,3 @@
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
-
-
--------------------------------------------------------------------------------
-This product bundles various third-party components under other open source
-licenses. This section summarizes those components and their licenses. See
-licenses/ for text of these licenses.
-
-Apache License, Version 2.0
----------------------------
-rust/libc
-rust/rust
-
-University of Illinois/NCSA Open Source License and MIT License
----------------------------------------------------------------
-rust/compiler-builtins
-
-BSD 2-Clause License
---------------------
-optee/build
-optee/optee_client
-optee/optee_os