Merge changes from topic "prebuilt-hiddenapi"

* changes:
  Supply LOCAL_SOONG_DEX_JAR for java_import with compile_dex.
  Enable an apex to include a java_import.
  Enable prebuilt hiddenapi CSV files.

android/config.go

@@ -1026,6 +1026,10 @@ func (c *config) HasMultilibConflict(arch ArchType) bool {
 	return c.multilibConflicts[arch]
 }
 
+func (c *config) PrebuiltHiddenApiDir(ctx PathContext) string {
+	return String(c.productVariables.PrebuiltHiddenApiDir)
+}
+
 func (c *deviceConfig) Arches() []Arch {
 	var arches []Arch
 	for _, target := range c.config.Targets[Android] {