Switch audio HAL to V7

Updated audio policy manager configuration files to comply
with the changes in the XML schema. This was done automatically
by running the following commands:

  hardware/interfaces/audio/7.0/config/update_audio_policy_config.sh \
    device/google/redfin/audio/audio_policy_configuration.xml 6.0

  hardware/interfaces/audio/7.0/config/update_audio_policy_config.sh \
    device/google/redfin/audio/audio_policy_configuration_a2dp_offload_disabled.xml 6.0

  hardware/interfaces/audio/7.0/config/update_audio_policy_config.sh \
    device/google/redfin/audio/audio_policy_configuration_bluetooth_legacy_hal.xml 6.0

Note: since bluetooth_hearing_aid_audio_policy_configuration.xml is
shared across all redbull-based devices, this file had to be
temporarily copied to device/google/redfin/audio before upgrading.

Bug: 142480271
Test: atest VtsHalAudioV7_0TargetTest
Test: atest VtsHalAudioEffectV7_0TargetTest
Change-Id: I1bd864019c417e6118a90dc1f45d97ae4e6c5d6e