Add dependency to list of asset files

We had a dependency on each file in the asset directories, but that
wouldn't cause aapt2 to run if a file was removed.  Add a dependency
on a file that contains the list of files in the asset directories.

Fixes: 172867096
Test: m CarrierConfig && rm packages/apps/CarrierConfig/assets/carrier_config_no_sim.xml && m CarrierConfig
Change-Id: I35f3b85355fa890a3e95eaa6458a21466b6930e4

android/module.go

@@ -331,6 +331,8 @@ type BaseContext interface {
 type ModuleContext interface {
 	BaseModuleContext
 
+	blueprintModuleContext() blueprint.ModuleContext
+
 	// Deprecated: use ModuleContext.Build instead.
 	ModuleBuild(pctx PackageContext, params ModuleBuildParams)
 
@@ -2544,6 +2546,10 @@ func (m *moduleContext) CheckbuildFile(srcPath Path) {
 	m.checkbuildFiles = append(m.checkbuildFiles, srcPath)
 }
 
+func (m *moduleContext) blueprintModuleContext() blueprint.ModuleContext {
+	return m.bp
+}
+
 // SrcIsModule decodes module references in the format ":name" into the module name, or empty string if the input
 // was not a module reference.
 func SrcIsModule(s string) (module string) {