Revert "Deprecate android.hidl.allocator after U vintf"

Revert submission 2904348-deprecate_hidl_allocator

Reason for revert: b/319562435

Reverted changes: /q/submissionid:2904348-deprecate_hidl_allocator

Change-Id: I47177a0d80f1fe648544bdca9b0e6792f1fbc043
diff --git a/transport/allocator/1.0/default/android.hidl.allocator@1.0-service.xml b/transport/allocator/1.0/default/android.hidl.allocator@1.0-service.xml
index 6fa909b..5218241 100644
--- a/transport/allocator/1.0/default/android.hidl.allocator@1.0-service.xml
+++ b/transport/allocator/1.0/default/android.hidl.allocator@1.0-service.xml
@@ -1,5 +1,5 @@
 <manifest version="1.0" type="framework">
-    <hal max-level="8">
+    <hal>
         <name>android.hidl.allocator</name>
         <transport>hwbinder</transport>
         <version>1.0</version>