Rename KEEP_CONNECTED_DOWNSTREAM_NETWORK to K_C_LOCAL_NETWORK am: 842a914dff

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2796004

Change-Id: I8df252ae963c0a409a74817dbdf1a04d7312471d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>