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: I0553f8b13e642f430501be6cf28556e7083fd0f7

Android.bp

diff --git a/Android.bp b/Android.bp
index 6060256..1c7192d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -94,7 +94,7 @@
 
     apex_available: [
         "//apex_available:platform",
-        "com.android.btservices",
+        "com.android.bt",
         "com.android.media.swcodec",
     ],
     min_sdk_version: "29",