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

In wificond, EventLoopCallback is derrived from MessageHandler,
which is derrived from RefBase, so we should be using sp<T>::make to
create the smart pointer so the incStrong will occur on the Refbase

Bug: 243362981
Test: Flash hwasan build and do wificond scan, do not observe crash.
Merged-In: Ia9505a2247bd129665ed3b1ca87f701f7e4c48f6
Change-Id: Ia9505a2247bd129665ed3b1ca87f701f7e4c48f6
(cherry picked from commit 77798e915cb1091111c511b41ede98d11858e23c)
Merged-In: Ia9505a2247bd129665ed3b1ca87f701f7e4c48f6
1 file changed