Remove makefile_goal

This was added to use 'make' target in soong. It was a hacky way and
caused many problems:
- can't track dependency
- doesn't work with sanitizer
- VSDK snapshot doesn't support
- ..

Now references are all gone. Let's remove it.

Bug: n/a
Test: m
Change-Id: I0336a490780f37a4e77d343c61315686e23db643

android/Android.bp

@@ -60,7 +60,6 @@ bootstrap_go_package {
         "license_metadata.go",
         "license_sdk_member.go",
         "licenses.go",
-        "makefile_goal.go",
         "makevars.go",
         "metrics.go",
         "module.go",