Modify apex_available to Bluetooth apex

Bluetooth apex name has changed from com.android.btservices to
com.android.bt. We now need to update the reference in the code.

Updating apex_available in bp and other reference from within the code

Bug: 383863941
Flag: Exempt build infra
Test: m .
Change-Id: Icd3922bde0c65b4a5dd2d95fd97708428f8a6f57
diff --git a/Android.bp b/Android.bp
index 5b4eefa..961f47f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -98,7 +98,7 @@
         // - no testing story/infra for deprecation schedule
         "//apex_available:platform",
         "com.android.neuralnetworks",
-        "com.android.btservices",
+        "com.android.bt",
         "com.android.media",
         "com.android.media.swcodec",
         "com.android.nfcservices",