Adding  min_sdk fields to compile with Bluetooth Apex

Bug: 206121418
Test: Compile
Change-Id: Ief1f5d1b15cea44d25a11b9b679259a1134b399b
diff --git a/Android.bp b/Android.bp
index 32eed33..cde6822 100644
--- a/Android.bp
+++ b/Android.bp
@@ -106,6 +106,7 @@
         "//apex_available:anyapex",
         "//apex_available:platform",
     ],
+    min_sdk_version: "29",
 }
 
 cc_library_static {