Upgrade RequireAPI annotation to prevent wrong lint error.

BluetoothA2dp#GetCodecStatus is made public (was SystemApi)
and linter will wrongly flag it as [NewApi] so we have to
either update the RequireApi or add a SuppressLint.

Bug: 170678351
Tag: #feature
Test: atest FrameworkBluetoothTests
Change-Id: I5325e66e245e91bf2ffba00b87fafc4ec3c714d2