Fix LeAudioCodecProvider failing offload setting file parsing

ParseFromLeAudioOffloadSettingFile() fails when `GetLeAudioCodecCapabilities()`
was already called in the past and `leAudioCodecCapabilities` vector is already
populated. That makes some of the VTS tests fail on
`IsOffloadOutputProviderInfoSupported()` and just return and PASS  without
actually checking enything.

The doubtful checks check variables set at parsed content verification,
and should not prevent us from parsing the file again.

Bug: 319090769
Test: atest VtsHalBluetoothAudioTargetTest
Change-Id: Iab6235b5d265bb254ae6075b8c32d0eae0fc1829