[DO NOT MERGE]Default disable unknown_tag_polling_delay

Developers can enable it by overlay.

Bug: 149273649
Test: no blocking polling
Merged-In: I5cf22b3698d0e974ec7c700fd08c18f96ecdd6ac
Change-Id: I5cf22b3698d0e974ec7c700fd08c18f96ecdd6ac
1 file changed