drm_hwcomposer: Use header library instead of hardcoded path

This allows to put drm_hwcomposer in any directory.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
diff --git a/tests/Android.bp b/tests/Android.bp
index c48c86a..e3dc13b 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -25,10 +25,12 @@
     srcs: ["worker_test.cpp"],
 
     vendor: true,
-    header_libs: ["libhardware_headers"],
+    header_libs: [
+        "drm_hwcomposer_headers",
+        "libhardware_headers",
+    ],
     static_libs: ["libdrmhwc_utils"],
     shared_libs: ["hwcomposer.drm"],
-    include_dirs: ["external/drm_hwcomposer"],
 }
 
 // Tool for listening and dumping uevents
@@ -38,9 +40,9 @@
     srcs: ["uevent_print.cpp"],
 
     vendor: true,
-    header_libs: ["libhardware_headers"],
-    shared_libs: ["liblog"],
-    include_dirs: [
-        "external/drm_hwcomposer",
+    header_libs: [
+        "drm_hwcomposer_headers",
+        "libhardware_headers",
     ],
+    shared_libs: ["liblog"],
 }