Remove AOSP-first preupload hook for system/security

This is no longer allowed.

Test: presubmit
Flag: EXEMPT no effect on builds
Change-Id: Idad64bd145ced067fedacdcf4a5fb18c659d14e8
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 9b96f36..7ba873b 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -5,6 +5,3 @@
 [Builtin Hooks Options]
 clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp
 rustfmt = --config-path=rustfmt.toml
-
-[Hook Scripts]
-aosp_hook = ${REPO_ROOT}/frameworks/base/tools/aosp/aosp_sha.sh ${PREUPLOAD_COMMIT} "."