Revert "Use platform security domains in keymint/gatekeeper sepolicy"

Revert submission 3312283-2024-10-18-schuffelen-sepolicy

Reason for revert: Droidmonitor created revert due to b/375059051. Will be verifying through ABTD before submission.

Reverted changes: /q/submissionid:3312283-2024-10-18-schuffelen-sepolicy

Change-Id: Icebd34eb9e2941a6480d9943986a104cc5249729
diff --git a/security/keymint/aidl/default/file_contexts b/security/keymint/aidl/default/file_contexts
index 41b02d5..dce7e3c 100644
--- a/security/keymint/aidl/default/file_contexts
+++ b/security/keymint/aidl/default/file_contexts
@@ -1,3 +1,3 @@
 (/.*)?                                                           u:object_r:vendor_file:s0
 /etc(/.*)?                                                       u:object_r:vendor_configs_file:s0
-/bin/hw/android\.hardware\.security\.keymint-service\.nonsecure  u:object_r:hal_keymint_default_exec:s0
+/bin/hw/android\.hardware\.security\.keymint-service\.nonsecure  u:object_r:hal_keymint_rust_exec:s0