Migrate to libyang2

Also update buildroot to latest master:
- the sdbus-cpp version bump patch has been removed, because upstream
  now bumped it to an even newer version

- Fix RAUC not able to start a service
(https://github.com/buildroot/buildroot/commit/72308ab9a32de6e8b4b23e42f115ed5ee87e5f33)

Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/netconf-cli/+/4539
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/netconf-cli/+/4539
Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/rousette/+/5391
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/rousette/+/5391
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/cla-sysrepo/+/5292
Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/velia/+/5237
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/velia/+/5237
Change-Id: I6edc19f35accfd41a4b32f7b396981d470e0c07b
diff --git a/dev-setup-git.sh b/dev-setup-git.sh
index caffcea..4f4316b 100755
--- a/dev-setup-git.sh
+++ b/dev-setup-git.sh
@@ -14,7 +14,9 @@
 SDBUS_CPP_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo/submodules/dependencies/sdbus-cpp
 
 LIBYANG_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo/submodules/dependencies/libyang
+LIBYANG_CPP_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo/submodules/dependencies/libyang-cpp
 SYSREPO_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo/submodules/dependencies/sysrepo
+SYSREPO_CPP_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo/submodules/dependencies/sysrepo-cpp
 HOST_SYSREPO_POST_RSYNC_HOOKS += HOST_SYSREPO_PATCH_USE_FAKE_DEV_SHM
 LIBNETCONF2_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo/submodules/dependencies/libnetconf2
 NETOPEER2_OVERRIDE_SRCDIR = ${CZECHLIGHT_BR2_EXT_LOC}/submodules/cla-sysrepo/submodules/dependencies/Netopeer2