Use sp<T>::make to create the sp pointer for EventLoopCallback am: 73bb787e6e

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/connectivity/wificond/+/20330791

Change-Id: I20d116fda32113a891c3edd95fddd02a45936f1c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>