Replace all FIRST_SDK_INT usage in Connectivity because it has been renamed to DEVICE_INITIAL_SDK_INT. Bug: 184735771 Test: m CtsNetTestCases Merged-In: I2f155592b08cdbf259a00b035cacb37ca9847e72 (clean cherry-pick) Change-Id: I2f155592b08cdbf259a00b035cacb37ca9847e72