[chip,dv] Refactor CSR exclusion method - Minor refactor of `csr_excl_item` - fixed minor bugs that existed in original code - split `has_excl` to cleanly separate the task of retrieving the associative array index from `exclusions` data structure into a separate local task. - cleaned up method doc comments - Added support for tmporarily disable exclusions in effect (request from @NigelScales) Signed-off-by: Srikrishna Iyer <sriyer@google.com>

OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.
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