Remove artApex parameter from ApexBundleFactory

Since coverage support was added to bootclasspath_fragment it is no
longer necessary to treat ART APEXes differently to other APEXes.

Bug: 177892522
Test: m droid
      m EMMA_INSTRUMENT=true EMMA_INSTRUMENT_FRAMEWORK=true
Change-Id: I1993ddbfe6f80a30820c1b8f76ebd8c757925deb
diff --git a/build/gki.go b/build/gki.go
index 208aaf8..e34130b 100644
--- a/build/gki.go
+++ b/build/gki.go
@@ -94,7 +94,7 @@
 }
 
 func testApexBundleFactory() android.Module {
-	return apex.ApexBundleFactory(true /* testApex */, false /* art */)
+	return apex.ApexBundleFactory(true /* testApex */)
 }
 
 // Create modules for a real APEX package that contains an OTA payload.