Fix header deps of sysprop_library

This adds public header to deps correctly.

Bug: 148123511
Bug: 149252327
Test: VNDK_SNAPSHOT_BUILD_ARTIFACTS=true m dist vndk
Change-Id: Ib8df3dfb4a068a11fc647de8588cc52889d82fba
diff --git a/cc/gen.go b/cc/gen.go
index 17ab45f..b0aadc6 100644
--- a/cc/gen.go
+++ b/cc/gen.go
@@ -162,17 +162,19 @@
 	})
 }
 
-func genSysprop(ctx android.ModuleContext, syspropFile android.Path) (android.Path, android.Path) {
+func genSysprop(ctx android.ModuleContext, syspropFile android.Path) (android.Path, android.Paths) {
 	headerFile := android.PathForModuleGen(ctx, "sysprop", "include", syspropFile.Rel()+".h")
 	publicHeaderFile := android.PathForModuleGen(ctx, "sysprop/public", "include", syspropFile.Rel()+".h")
 	cppFile := android.PathForModuleGen(ctx, "sysprop", syspropFile.Rel()+".cpp")
 
+	headers := android.WritablePaths{headerFile, publicHeaderFile}
+
 	ctx.Build(pctx, android.BuildParams{
-		Rule:           sysprop,
-		Description:    "sysprop " + syspropFile.Rel(),
-		Output:         cppFile,
-		ImplicitOutput: headerFile,
-		Input:          syspropFile,
+		Rule:            sysprop,
+		Description:     "sysprop " + syspropFile.Rel(),
+		Output:          cppFile,
+		ImplicitOutputs: headers,
+		Input:           syspropFile,
 		Args: map[string]string{
 			"headerOutDir": filepath.Dir(headerFile.String()),
 			"publicOutDir": filepath.Dir(publicHeaderFile.String()),
@@ -181,7 +183,7 @@
 		},
 	})
 
-	return cppFile, headerFile
+	return cppFile, headers.Paths()
 }
 
 func genWinMsg(ctx android.ModuleContext, srcFile android.Path, flags builderFlags) (android.Path, android.Path) {
@@ -259,9 +261,9 @@
 			srcFiles[i] = rcFile
 			deps = append(deps, headerFile)
 		case ".sysprop":
-			cppFile, headerFile := genSysprop(ctx, srcFile)
+			cppFile, headerFiles := genSysprop(ctx, srcFile)
 			srcFiles[i] = cppFile
-			deps = append(deps, headerFile)
+			deps = append(deps, headerFiles...)
 		}
 	}