Revert "Create the feature flag for leaudio_dynamic_switcher_refactor_for_broadcast"

This reverts commit c4c7182c.

Reason for revert: design was discussed and change via aosp/2890841. Remove the unused flag.

Bug: 273153850
Bug: 317776633
Test: m com.android.btservices
Change-Id: I1363563f4a8c5a080cc0d962d9bd5cc114fcef35

flags/leaudio.aconfig

@@ -77,13 +77,6 @@ flag {
     bug: "316927319"
 }
 
-flag {
-    name: "leaudio_dynamic_switcher_refactor_for_broadcast"
-    namespace: "bluetooth"
-    description: "LE Audio dynamic switcher refactor for broadcast"
-    bug: "317776633"
-}
-
 flag {
     name: "le_audio_fast_bond_params"
     namespace: "bluetooth"