Revert "Delete SyspropMutator"

This reverts commit 2db49e32695470be11a3d12b10890aa39700dbb2.

Reason for revert: Break aosp build on git_tm-dev-plus-aosp and downstream branches

Change-Id: I0a86bf5e1e1f2ddf71308250f9110a9608ac2d8d
Bug: 246355583
diff --git a/cc/Android.bp b/cc/Android.bp
index 01478f3..ce94467 100644
--- a/cc/Android.bp
+++ b/cc/Android.bp
@@ -45,6 +45,7 @@
         "snapshot_utils.go",
         "stl.go",
         "strip.go",
+        "sysprop.go",
         "tidy.go",
         "util.go",
         "vendor_snapshot.go",