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

This reverts commit 82e13c426900a5556d57b56a0c244a213f2e9fe7.

Bug: b/374158137
Change-Id: I7e689444d2bd4a41e0b987e163ef0e97f161ac47
Test: with other changes in topic
diff --git a/security/keymint/aidl/default/file_contexts b/security/keymint/aidl/default/file_contexts
index dce7e3c..41b02d5 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_rust_exec:s0
+/bin/hw/android\.hardware\.security\.keymint-service\.nonsecure  u:object_r:hal_keymint_default_exec:s0