[Audiosharing] Update QR code format to follow BT SIG standard

Bug: 324655158
Test: atest com.android.settingslib.bluetooth.BluetoothLeBroadcastMetadataExtTest
Test: manually tested with broadcast source and assistant by QR code
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:4abfa5bed1a35a9a9b5ac54951296b3edde4ee9a)
Merged-In: I798666b89c4e3558c7528bace0346caf8218dc53
Change-Id: I798666b89c4e3558c7528bace0346caf8218dc53
3 files changed