leaudio: Handle VX_AOSP_SAMPLESOUND tag

If Metadata tag contains VX_AOSP_SAMPLESOUND tag it means, that content
type and usage can be skipped as sound which is going to be played is
just a sample played for the user.

Bug: 274106369
Test: atest bluetooth_le_audio_client_test
Tag: #feature
Change-Id: I6d23b2285dee96b80817b7c5c9b72a6463a454b0