Add static for constant

Bug: 182963397
Test: atest IpConnectivityMetricsTest
Test: atest NetdEventListenerServiceTest
Change-Id: I3826b9efc3418a724bd3753b9ad573adc3343b72
Merged-In: I3826b9efc3418a724bd3753b9ad573adc3343b72
  (cherry-picked from ag/13975513)
2 files changed