Specify log_path in openwrt am: 5e7bec2534 am: 5543ea8a85

Original change: https://android-review.googlesource.com/c/platform/external/openwrt-prebuilts/+/2098744

Change-Id: I142a1c91d01bcd532fd7ca5ce715124264160402
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>