wifi(implementation): Reduce logging severity

IE elements should not be present in the batched scan results, but it
being there doesn't cause any problems. The IE elements will be ignored
when we send it over the HIDL interface, so reduce the log level to
prevent log spamming.

Bug: 64448186
Test: None
Change-Id: Ia0d0312a113c907bb0992bb8f41e734fe9d05114