Earlgrey register definitions

These register definitions were created by running kor's topgen-extract utility (from his usergit) against the earlgrey_1.0.0 branch.

cargo run -- chip_to_ureg \
    ~/opentitan/earlgrey_1.0.0 \
    top_earlgrey \
    ~/openprot/target/earlgrey/registers

I ran topgen-extract with PR#15 applied to caliptra-ureg.