Remove fs_config_generator.py symlink

Symlinks were previously able to escape the genrule sandbox, but
after aosp/2850015 they can't.

Instead of a symlink, just use the fs_config_generator soong module.

Bug: 307824623
Test: generated_android_ids
Change-Id: Ifcd9eb06c46181903ff57713132940939d5facf6
diff --git a/libc/Android.bp b/libc/Android.bp
index c816bdf..6f36aad 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1052,8 +1052,8 @@
     name: "generated_android_ids",
     out: ["generated_android_ids.h"],
     srcs: [":android_filesystem_config_header"],
-    tool_files: ["fs_config_generator.py"],
-    cmd: "$(location fs_config_generator.py) aidarray $(in) > $(out)",
+    tools: ["fs_config_generator"],
+    cmd: "$(location fs_config_generator) aidarray $(in) > $(out)",
 }
 
 // ========================================================