Add initial bp2build convert for prebuilt_etc modules.

Test: Added unit test.

Change-Id: Ie63674e4a867e355e4667b4240979b822f0f3c86
diff --git a/bp2build/Android.bp b/bp2build/Android.bp
index 6ab062e..c9f2c0b 100644
--- a/bp2build/Android.bp
+++ b/bp2build/Android.bp
@@ -23,6 +23,7 @@
         "soong-bazel",
         "soong-cc",
         "soong-cc-config",
+        "soong-etc",
         "soong-genrule",
         "soong-python",
         "soong-sh",
@@ -37,6 +38,7 @@
         "cc_library_static_conversion_test.go",
         "cc_object_conversion_test.go",
         "conversion_test.go",
+        "prebuilt_etc_conversion_test.go",
         "python_binary_conversion_test.go",
         "sh_conversion_test.go",
         "testing.go",