Add RegistryOpenParametersKey

Add RegistryOpenParametersKey

Use IoOpenDriverRegistryKey to avoid opening an absolute registry path.
Driver Verifier can detect registry isolation violations when running WHQL
tests on Server 2025. The rule states that a driver may not open an absolute
registry key path. Use the specific API to open the 'Parameters' key with
KEY_READ when querying settings.

Signed-off-by: Owen Smith <owen.smith@cloud.com>
Cosmetic fix-up.

Signed-off-by: Paul Durrant <pdurrant@amazon.com>