Added TestPartitionOpener_group

Added TestPartitionOpener_group for test_partition_opener.cpp, as this
file shall be used by liblp_apis_fuzzer and liblp_test_defaults

Test: make TestPartitionOpener_group
Bug: 285829660

Change-Id: I01da0a6896409af99af9e89092f6e1e3760cf4c2
diff --git a/fs_mgr/liblp/Android.bp b/fs_mgr/liblp/Android.bp
index 996ffd7..24eebdf 100644
--- a/fs_mgr/liblp/Android.bp
+++ b/fs_mgr/liblp/Android.bp
@@ -93,8 +93,8 @@
     srcs: [
         "builder_test.cpp",
         "super_layout_builder_test.cpp",
-        "test_partition_opener.cpp",
         "utility_test.cpp",
+        ":TestPartitionOpener_group",
     ],
 }
 
@@ -122,3 +122,8 @@
     name: "vts_kernel_liblp_test",
     defaults: ["liblp_test_defaults"],
 }
+
+filegroup {
+   name: "TestPartitionOpener_group",
+   srcs: [ "test_partition_opener.cpp"],
+}