Adding libc++ and bt apex availablity to libs in grpc

Bug: 206121418
Test: Compile
Change-Id: I858aedceffe03026158158acfed5b52fc5f28547
diff --git a/Android.bp b/Android.bp
index 3edd4b6..bd547c9 100644
--- a/Android.bp
+++ b/Android.bp
@@ -48,6 +48,12 @@
     ],
     host_supported: true,
     vendor_available: true,
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.bluetooth",
+    ],
+    stl: "libc++",
+    min_sdk_version: "30"
 }
 
 cc_library_host_static {