Add host side aconfig lib for usb flags

This is for hostside cts testing

Bug: 309127822
Test: atest CtsStatsdAtomHostTestCases:UsbStatsTests
Change-Id: I18f4a6a57c85f53cca87a36b1737d78262bd5052

AconfigFlags.bp

@@ -738,6 +738,13 @@ java_aconfig_library {
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
 
+java_aconfig_library {
+    name: "android.hardware.usb.flags-aconfig-java-host",
+    aconfig_declarations: "android.hardware.usb.flags-aconfig",
+    host_supported: true,
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}
+
 // WindowingTools
 aconfig_declarations {
     name: "android.tracing.flags-aconfig",