Allow crash_dump to read misctrl properties

This is used to determine if the device has been in 16k page size mode
to help debug issues with that.

Test: debuggerd_test with ro.misctl.16kb_before="1"
Bug: 335247092
Change-Id: I7b5fcd39cc5b3247d866814fbcf53299d68846c2
diff --git a/private/property.te b/private/property.te
index 994594d..4ce2d54 100644
--- a/private/property.te
+++ b/private/property.te
@@ -231,6 +231,7 @@
   -init
   -dumpstate
   -misctrl
+  -crash_dump
   userdebug_or_eng(`-su')
 } misctrl_prop:file no_rw_file_perms;
 neverallow {