sb/intel/lynxpoint: Use unions for MEI registers
Wrap bitfield structs in unions to reduce pointer usage. This adds more
uses of the `mei_dump()` function, only used for debugging. Refactoring
the MEI CSR functions to not use pointers is done in a follow-up.
Change-Id: I4defbb8c0e7812bf95c672ce529959f67c34537a
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59623
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>