pno recency: settings flag impl

Implementation to disable feature through settings flag.

Bug: 75956033
Test: compile, unit tests
Test: adb shell dumpsys wifi | grep "PNO scan recency sorting enabled"
and verify the flag is set to "false"
run adb shell settings put global wifi_pno_recency_sorting_enabled 1
Look at the flag through dumpsys again and verify it's now set to "true"
Change-Id: Id95da0730d8b7d4d49c77671e4b308a4e2cbfd3b
2 files changed