Bluetooth: Audio: Add select BT_GATT_DYNAMIC_DB for audio services

Many/most LE Audio services are dynamically registered,
but have been enabled without BT_GATT_DYNAMIC_DB.

Add select BT_GATT_DYNAMIC_DB for the services. Select
was used instead of depends on to make it simpler
to enable them.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>