Rename KEEP_CONNECTED_DOWNSTREAM_NETWORK to K_C_LOCAL_NETWORK am: 842a914dff am: b7794d5871

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

Change-Id: I7f5ca3b7892302f86256c202e97b4638ea3cd74e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>