Avoid passing around []hiddenAPIModule

Previously, an []android.Module was converted to an []hiddenAPIModule
that was then used to retrieve boot dex jars. That was ok when
obtaining the dex jar files from source modules for
bootclasspath_fragment but does not work well for other use cases as
it would require doing that conversion in multiple places.

This change pushes the use of hiddenAPIModule down to the methods that
retrieve information from it which makes the methods more flexible and
easier to reuse.

Bug: 177892522
Test: m nothing
Change-Id: Ib84aaf03d8f5a63b48232036fe4589646fc23352

java/platform_bootclasspath.go

@@ -290,16 +290,14 @@ func (b *platformBootclasspathModule) generateHiddenAPIBuildActions(ctx android.
 	// Use the flag files from this module and all the fragments.
 	input.FlagFilesByCategory = monolithicInfo.FlagsFilesByCategory
 
-	hiddenAPIModules := gatherHiddenAPIModuleFromContents(ctx, modules)
-
 	// Generate the monolithic stub-flags.csv file.
-	bootDexJars := extractBootDexJarsFromHiddenAPIModules(ctx, hiddenAPIModules)
+	bootDexJars := extractBootDexJarsFromModules(ctx, modules)
 	stubFlags := hiddenAPISingletonPaths(ctx).stubFlags
 	rule := ruleToGenerateHiddenAPIStubFlagsFile(ctx, stubFlags, bootDexJars, input)
 	rule.Build("platform-bootclasspath-monolithic-hiddenapi-stub-flags", "monolithic hidden API stub flags")
 
 	// Extract the classes jars from the contents.
-	classesJars := extractClassJarsFromHiddenAPIModules(ctx, hiddenAPIModules)
+	classesJars := extractClassesJarsFromModules(modules)
 
 	// Generate the annotation-flags.csv file from all the module annotations.
 	annotationFlags := android.PathForModuleOut(ctx, "hiddenapi-monolithic", "annotation-flags.csv")