leaudio: Add priority to ringtone context type

Since ringtone is actually preparation for the conversation and we are
using configuration as a conversation, make sure it will not be changed
to media.

This patch also improves logging a bit

Bug: 233961821
Test: atest BluetoothInstrumentationTests
Test: phone call
Tag: #feature
Merged-In: Id624a1a331a7dadf3e2779cfde7504aa1b926abe
Change-Id: Id624a1a331a7dadf3e2779cfde7504aa1b926abe
(cherry picked from commit 59fb5f0d)