added .clangd config file. initialized uninitialized variables am: da4f72913f

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2205476

Change-Id: Ic27e38a36b61b3b20f4a7bd8bd262ae05c41175b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>