This change enables the TETHERING_AND_P2P_GO_LOCAL_AGENT feature
on devices running Android 25Q4 or newer, in addition to being
controlled by the existing feature flag.
A new SdkUtil.isAtLeast25Q4() method is introduced to check for
the specific SDK version.
Flag: com.android.tethering.mainline.beta.tethering_and_p2p_go_local_agent
Test: atest ConnectivityCoverageTests --update-device \
--test-filter '.*Tethering.*'
Test: TH
Bug: 420590461
Fix: 428098654
Fix: 420592689
Change-Id: I7ef79a201116de84f2c4973c4c360fd3d1ef0c4c
bf75afdcd1