Ignore battery level update via vendor specific commands when HF indicator support is enabled.

Bug: 382026100
Bug: 385870861
Test: atest -v RemoteDevicesTest#testResetBatteryLevel_testHfpBatteryIndicatorEnabled -c
Flag: com.android.bluetooth.flags.enable_battery_level_update_only_through_hf_indicator
Change-Id: I7af580e7e7aa372f3c5caa45180aa019fecd6f13