WifiServiceImpl: add flush to log messages

Some calls to flush() were missed for WifiLog calls.  Added those in.

(cherry picked from commit 6ff6c1870e9f820c471b74e0976a45207da84217)

Bug: 73094025
Test: m javac-check-wifi-service RUN_ERROR_PRONE=true
Merged-In: I182eaded2b4a03aef5571e63a0f8d8f9621c8311
Change-Id: I182eaded2b4a03aef5571e63a0f8d8f9621c8311
1 file changed