Add build_prop soong module

build_prop is a soong module generating {partition}/build.prop. It's
ported from build/make/core/sysprop.mk and will replace sysprop.mk in
the future. Currently used only by Android.bp cuttlefish system image.

Bug: 322090587
Bug: 346214958
Test: compare system/build.prop and aosp_cf_x86_64_system-build.prop for
      eng / user / userdebug
Change-Id: Iad76139fe86ec4f582218c185aa15baeacaa38dc
diff --git a/android/Android.bp b/android/Android.bp
index 21ef59f..ce8c9b0 100644
--- a/android/Android.bp
+++ b/android/Android.bp
@@ -38,6 +38,7 @@
         "arch_list.go",
         "arch_module_context.go",
         "base_module_context.go",
+        "build_prop.go",
         "buildinfo_prop.go",
         "config.go",
         "test_config.go",