Remove local libyang-cpp and sysrepo-cpp

It has been included in buildroot

package/sysrepo-cpp/0002-fix-implicit-dependency-on-optional.patch

@@ -1,33 +0,0 @@
-From e49463aba8b44b932fdd342d1c1d117e70414aba Mon Sep 17 00:00:00 2001
-From: Edoardo Bortolozzo <edoardo.bortolozzo@thinkquantum.com>
-Date: Fri, 17 Oct 2025 18:08:47 +0200
-Subject: [PATCH 2/9] fix: implicit dependency on optional
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-Organization: Wires
-
-chrono imports optional in gcc >=13.
-added the explicit include to compile in gcc <=12.
-
-Change-Id: I18cc1a45ab522ee6738d4bc7080696cba8284903
-Signed-off-by: Mattias Walström <lazzer@gmail.com>
----
- include/sysrepo-cpp/Connection.hpp | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/include/sysrepo-cpp/Connection.hpp b/include/sysrepo-cpp/Connection.hpp
-index bf72bcd..a469a2c 100644
---- a/include/sysrepo-cpp/Connection.hpp
-+++ b/include/sysrepo-cpp/Connection.hpp
-@@ -7,6 +7,7 @@
- */
- #pragma once
- 
-+#include <optional>
- #include <chrono>
- #include <memory>
- #include <string>
--- 
-2.43.0
-