Fix hdl import causing install platform xsim to fail

What this MR does / why we need it:

Fixes "install-platform.sh xsim" from failing due to being unable to locate Hdl libs

Steps to complete before submitting MR:

• I have read Contribution guidelines

Release Notes

N/A

Changelog

bug(tools): fix HDL primitive search algorithm in tools/include/hdl/hdl-search.mk

Which issue(s) this MR closes

Closes #1211 (closed)