le_audio: Create descriptor for added from storage device

This CL allows to create device descriptor also for device added from
storage.

Tag: #feature
Bug: 261362580
Test: atest GoogleBluetoothInstrumentationTests
Change-Id: I0766618bee072d4f058633b5016dc69386e2724e
Merged-In: I0766618bee072d4f058633b5016dc69386e2724e
(cherry picked from commit fb806f0e)