tests: Create res-testdata for testdata pickup.

It doesn't change the functionality of the test, but allows easier
conversion to Soong.

Test: Run recovery_component_test on marlin.
Change-Id: Ic7419dc86c6b220531ae44e49ab4657394a5d7fa
diff --git a/tests/component/resources_test.cpp b/tests/component/resources_test.cpp
index 618d5a4..b00c3d5 100644
--- a/tests/component/resources_test.cpp
+++ b/tests/component/resources_test.cpp
@@ -32,10 +32,11 @@
 
 static const std::string kLocale = "zu";
 
-static const std::vector<std::string> kResourceImagesDirs{ "res-mdpi/images/", "res-hdpi/images/",
-                                                           "res-xhdpi/images/",
-                                                           "res-xxhdpi/images/",
-                                                           "res-xxxhdpi/images/" };
+static const std::vector<std::string> kResourceImagesDirs{
+  "res-testdata/res-mdpi/images/",    "res-testdata/res-hdpi/images/",
+  "res-testdata/res-xhdpi/images/",   "res-testdata/res-xxhdpi/images/",
+  "res-testdata/res-xxxhdpi/images/",
+};
 
 static int png_filter(const dirent* de) {
   if (de->d_type != DT_REG || !android::base::EndsWith(de->d_name, "_text.png")) {