Don't audit mnt_produt_file in dumpstate.

CTS testcase is failing because of the AVC denails for dumpstate
trying to search mnt_product.

Bug: 234086759
Test: android.security.cts.SELinuxHostTest#testNoBugreportDenials
Change-Id: I794de8c296992b1d3cdafdb802376870a0eecce7
Merged-In: I794de8c296992b1d3cdafdb802376870a0eecce7
diff --git a/public/dumpstate.te b/public/dumpstate.te
index 8d3e556..5eb3d27 100644
--- a/public/dumpstate.te
+++ b/public/dumpstate.te
@@ -336,6 +336,7 @@
   mnt_vendor_file
   mirror_data_file
   mnt_user_file
+  mnt_product_file
 }:dir search;
 dontaudit dumpstate {
   apex_mnt_dir